The octyllion is equal to \(10^{1,024}\) in the myriad system[1][2], or 10 squared 10 times. It is 1,025 digits long. Nirvana Supermind calls this number unectol, and it's equal to \(r(10,1)\) in Rampant Array Notation[3].

Decimal expansion

10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Approximations

Notation Lower bound Upper bound
Scientific notation \(1\times10^{1024}\)
Arrow notation \(10\uparrow1024\)
Steinhaus-Moser Notation 394[3] 395[3]
Copy notation 9[1024] 1[1025]
Taro's multivariable Ackermann function A(3,3398) A(3,3399)
Pound-Star Notation #*((70))*19 #*((71))*19
BEAF {10,1024}
Hyper-E notation E1,024
Bashicu matrix system (0)(1)[3] (0)(1)[4]
Hyperfactorial array notation 458! 459!
Fast-growing hierarchy \(f_2(3\,389)\) \(f_2(3\,390)\)
Hardy hierarchy \(H_{\omega^2}(3\,389)\) \(H_{\omega^2}(3\,390)\)
Slow-growing hierarchy \(g_{\omega^{\omega^3+\omega \times 2+4}}(10)\)

Sources

See also

Basic notation:
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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