The septuagintyllion is equal to \(10^{2^{72}} = 10^{4,722,366,482,869,645,213,696}\) in the myriad system[1], or 10 squared 72 times. It is equal to one followed by 4,722,366,482,869,645,213,696 (or approx. 5 sextillion) zeros. It is 272+1 digits long.

Names in -illion systems

In the short scale, it is also called:

ten milliquattuorseptuagintaquingentilliduoviginticentillisexagintacentillisesquinquagintanongentillioctoquadragintaquingentilliquattuorquadringentilliquattuorsexagintaquingentillion

According to Landon Curt Noll's The English name of a number, septuagintyllion is also known as:

ten milliamilliamilliamilliamilliamilliamilliaquingenquattuorseptuaginmilliamilliamilliamilliamilliamilliacenduoviginmilliamilliamilliamilliamilliacensexaginmilliamilliamilliamillianongensexquinquaginmilliamilliamilliaquingenoctoquadraginmilliamilliaquadringenquattuormilliaquingenquattuorsexagintillion

Approximations in other notations

Notation Lower bound Upper bound
Scientific notation \(10^{4,722,366,482,869,645,213,696}\)
Arrow notation \(10\uparrow2\uparrow72\)
Down-arrow notation \(453\downarrow\downarrow9\) \(61\downarrow\downarrow13\)
Steinhaus-Moser Notation 16[3][3] 17[3][3]
Copy notation 4[4[22]] 5[5[22]]
H* function H(H(6)) H(2H(6))
Taro's multivariable Ackermann function A(3,A(3,70)) A(3,A(3,71))
Pound-Star Notation #*((1))*(2,1,6)*3 #*((1))*(3,1,6)*3
BEAF {10,{2,72}}
Hyper-E notation EE[2]72
Bashicu matrix system (0)(1)[8] (0)(1)[9]
Hyperfactorial array notation (21!)! (22!)!
Fast-growing hierarchy \(f_2(f_2(67))\) \(f_2(f_2(68))\)
Hardy hierarchy \(H_{\omega^22}(67)\) \(H_{\omega^22}(68)\)
Slow-growing hierarchy \(g_{\omega^{\omega^{\omega2+1}4}}(10)\) \(g_{\omega^{\omega^{\omega2+1}5}}(10)\)

Sources

See also

myllion byllion tryllion quadryllion quintyllion
sextyllion septyllion octyllion nonyllion decyllion
undecyllion duodecyllion tredecyllion quattuordecyllion quindecyllion
sexdecyllion septdecyllion octodecyllion novemdecyllion vigintyllion
unvigintyllion duovigintyllion trevigintyllion quattuorvigintyllion quinvigintyllion
sexvigintyllion septemvigintyllion octovigintyllion novemvigintyllion trigintyllion
untrigintyllion duotrigintyllion tretrigintyllion quattuortrigintyllion quintrigintyllion
sextrigintyllion septtrigintyllion octotrigintyllion novemtrigintyllion quadragintyllion
quinquagintyllion sexagintyllion septuagintyllion octogintyllion nonagintyllion
centyllion ducentyllion trecentyllion quadringentyllion quingentyllion
sescentyllion septingentyllion octingentyllion nongentyllion millyllion
myryllion micryllion nanyllion picyllion femtyllion
attyllion zeptyllion yoctyllion googolyllion latinlatinlatinbyllionyllionyllionyllion
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