# -Illion Numbers

We're all familiar with numbers like million, billion, or trillion - but how far do the "illion" numbers go, the furthest I've seen in the literature is milli-millillion (10^3000003) which I call a micrillion. Some time ago (about 15 years or so), being interested in giant numbers, I have invented names for illion numbers past a centillion (highest that I've seen in books at that time) - by continuing the trend: deci, centi, by using milli, micro, nano, pico, femto, and atto. Sometime later, I found out that I wasn't the only one to choose the name "millillion" for 10^3003 - I found this name mentioned on Robert Munafo's fascinating web site on large numbers. Following is a list of the "illion" numbers (those above millillion are names I invented), along with googol, googolplex, and googolduplex for size reference. The ones less than micrillion are shown on the above mentioned web site, naming rules up to the millillion range are mentioned in The Book of Numbers by Conway and Guy. I recently changed some of the numbers to match with the polytope suffixes. In 2022, due to the new prefixes ronna, ronto, quetta, and quecto, I changed a few illion names.

Million - 1,000,000

Billion - 1,000,000,000

Trillion - 10^12

Quintillion - 10^18

Sextillion - 10^21

Septillion - 10^24

Octillion - 10^27

Nonillion - 10^30

Decillion - 10^33

Undecillion - 10^36

Doedecillion - 10^39

Tredecillion - 10^42

Quattuordecillion - 10^45

Quindecillion - 10^48

Sexdecillion - 10^51

Septendecillion - 10^54

Octodecillion - 10^57

Novemdecillion - 10^60

Vigintillion - 10^63

Trigintillion - 10^93

Googol - 10^100 - shown for comparison

Quinquagintillion - 10^153

Sexagintillion - 10^183

Septuagintillion - 10^213

Octogintillion - 10^243

Nonagintillion - 10^273

Centillion - 10^303

Cenuntillion - 10^306

Duocentillion - 10^309

Centretillion - 10^312

Ducentillion - 10^603

Trecentillion - 10^903

Quingentillion - 10^1503

Sescentillion - 10^1803

Septingentillion - 10^2103

Octingentillion - 10^2403

Nongentillion - 10^2703

Millillion - 10^3003

*Platillion - 10^6000

Myrillion - 10^30003

Micrillion - 10^ 3000003

Nanillion - 10^ 3billion3

Picillion - 10^ 3trillion3

Attillion - 10^ 3 quintillion3

Zeptillion - 10^ 3sextillion3

Yoctillion - 10^ 3septillion3

Rontillion - 10^ 3octillion3 - old name xonillion

Quectillion - 10^ 3nonillion3 - old name vecillion

Mecillion - 10^ 3decillion3

Duecillion - 10^ 3undecillion3

Trecillion - 10^ 3doedecillion3

Tetrecillion - 10^ 3tridecillion3

Pentecillion - 10^ 3quattuordecillion3

Hexecillion - 10^ 3quindecillion3

Heptecillion - 10^ 3sexdecillion3

Octecillion - 10^ 3septendecillion3

Ennecillion - 10^ 3octodecillion3

Icosillion - 10^ 3novemdecillion3

Triacontillion - 10^ (3x10^90+3)

Googolplex - 10^10^100 - shown for comparison

Tetracontillion - 10^ (3x10^120+3)

Pentacontillion - 10^ (3x10^150+3)

Hexacontillion - 10^ (3x10^180+3)

Heptacontillion - 10^ (3x10^210+3)

Octacontillion - 10^ (3x10^240+3)

Ennacontillion - 10^ (3x10^270+3)

Hectillion - 10^ (3x10^300+3)

Killillion - 10^ (3x10^3000+3)

Megillion - 10^ (3x10^3million +3)

Gigillion - 10^ (3x10^3billion +3)

Terillion - 10^ (3x10^3trillion +3)

Exillion - 10^ (3x10^3quintillion +3)

Zettillion - 10^ (3x10^3sextillion +3)

Yottillion - 10^ (3x10^3septillion +3)

Ronnillion - 10^ (3x10^3octillion +3) - old name xennillion

Quettillion - 10^ (3x10^3nonillion +3) - old name dakillion, older name vekillion

Hendillion - 10^ (3x10^3decillion +3) - old name mekillion

Dokillion - 10^ (3x10^3undecillion +3) - old name duekillion

Tradakillion - 10^ (3x10^3doedecillion +3) - old name trekillion

Tedakillion - 10^ (3x10^3tridecillion +3) - old name tetrekillion

Pedakillion - 10^ (3x10^3quattuordecillion +3) - old name pentekillion

Exdakillion - 10^ (3x10^3quindecillion +3) - old name hexekillion

Zedakillion - 10^ (3x10^3sexdecillion +3) - old name heptekillion

Yodakillion - 10^ (3x10^3septendecillion +3) - old name octekillion

Nedakillion - 10^ (3x10^3octodecillion +3) - old name ennekillion

Ikillion - 10^ (3x10^(3x10^60) +3) - old name twentillion

Ikenillion - 10^ (3x10^(3x10^63) +3)

Icodillion - 10^ (3x10^(3x10^66) +3)

Ictrillion - 10^ (3x10^(3x10^69) +3) - old name triatwentillion

Icterillion - 10^ (3x10^(3x10^72) +3)

Icpetillion - 10^ (3x10^(3x10^75) +3)

Ikectillion - 10^ (3x10^(3x10^78) +3)

Iczetillion - 10^ (3x10^(3x10^81) +3)

Ikyotillion - 10^ (3x10^(3x10^84) +3)

Icronillion - 10^ (3x10^(3x10^87) +3) - old name icxenillion

Trakillion - 10^ (3x10^(3x10^90) +3) - old name thirtillion

Googolduplex - 10^10^10^100 - shown for comparison

Tekillion - 10^ (3x10^(3x10^120) +3) - old name fortillion

Pekillion - 10^ (3x10^(3x10^150) +3) - old name fiftillion

Exakillion - 10^ (3x10^(3x10^180) +3) - old name sixtillion

Zakillion - 10^ (3x10^(3x10^210) +3) - old name seventillion

Yokillion - 10^ (3x10^(3x10^240) +3) - old name eightillion

Nekillion - 10^ (3x10^(3x10^270) +3) - old name nintillion

Hotillion - 10^ (3x10^(3x10^300) +3) - old name hundrillion

Botillion - 10^ (3x10^(3x10^600) +3)

Trotillion - 10^ (3x10^(3x10^900) +3)

Totillion - 10^ (3x10^(3x10^1200) +3)

Potillion - 10^ (3x10^(3x10^1500) +3)

Exotillion - 10^ (3x10^(3x10^1800) +3)

Zotillion - 10^ (3x10^(3x10^2100) +3)

Yootillion - 10^ (3x10^(3x10^2400) +3)

Notillion - 10^ (3x10^(3x10^2700) +3)

Kalillion - 10^ (3x10^(3x10^3000) +3) - old name thousillion

Dalillion - 10^ (3x10^(3x10^6000) +3)

Tralillion - 10^ (3x10^(3x10^9000) +3)

Talillion - 10^ (3x10^(3x10^12,000) +3)

Palillion - 10^ (3x10^(3x10^15,000) +3)

Exalillion - 10^ (3x10^(3x10^18,000) +3)

Zalillion - 10^ (3x10^(3x10^21,000) +3)

Yalillion - 10^ (3x10^(3x10^24,000) +3)

Nalillion - 10^ (3x10^(3x10^27,000) +3)

Dakalillion - 10^ (3*10^ (3*10^30,000) +3) - also called *manillion

Hotalillion - 10^ (3*10^ (3*10^300,000) +3) - also called *lakhillion

Mejillion - 10^ (3x10^(3x10^3,000,000) +3)

Dakejillion - 10^ (3*10^ (3*10^30,000,000) +3) - also called *crorillion

Hotejillion - 10^ (3*10^ (3*10^300,000,000) +3) - also called *awkillion

Googoltriplex - 10^10^10^10^100 - shown for comparison

Gijillion - 10^ (3x10^(3x10^3,000,000,000) +3)

*Bentrizillion - 10^ (6*10^ (6*10^ (6*10^6billion)))

Astillion - 10^ (3x10^(3x10^3trillion) +3)

Fermillion - 10^ (3x10^(3x10^3quintillion) +3)

Jovillion - 10^ (3x10^(3x10^3sextillion) +3)

Solillion - 10^ (3x10^(3x10^3septillion) +3)

Betillion - 10^ (3x10^(3x10^3octillion) +3)

Glocillion - 10^ (3x10^(3x10^3nonillion) +3)

Gaxillion - 10^ (3x10^(3x10^3decillion) +3)

Supillion - 10^ (3x10^(3x10^3undecillion) +3)

Versillion - 10^ (3x10^(3x10^3dodecillion) +3)

Multillion - 10^ (3x10^(3x10^3tredecillion) +3)

Googolquadraplex - 10^10^10^10^10^100 - shown for comparison

Googolquinplex - 10^10^10^10^10^10^100 - shown for comparison

* - Number names denoted with an asterisk were mentioned to me, but I have no idea where they originated.