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Oct-tritillion is equal to H(38) = H(6,561) = 1019,686.[1] The name was coined by SuperJedi224.

Decimal expansion

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Approximations

Notation Lower bound Upper bound
Scientific notation \(1\times10^{19\,686}\)
Arrow notation \(10\uparrow19\,686\)
Steinhaus-Moser Notation 5[3][3] 6[3][3]
Copy notation 9[19686] 1[19687]
Taro's multivariable Ackermann function A(3,65392) A(3,65393)
Pound-Star Notation #*((994))*70 #*((995))*70
BEAF {10,19686}
Hyper-E notation E19,686
Bashicu matrix system (0)(1)[3] (0)(1)[4]
Hyperfactorial array notation (7!)! (8!)!
Fast-growing hierarchy \(f_2(f_2(12))\) \(f_2(f_2(13))\)
Hardy hierarchy \(H_{\omega^22}(12)\) \(H_{\omega^22}(13)\)
Slow-growing hierarchy \(g_{\omega^{\omega^4+\omega^39+\omega^26+\omega8+6}}(10)\)

Sources

"-Illion" numbers by SuperJedi224

Numbers By SuperJedi224

Fibonacci Numbers

Pound-Star Notation

Based on the Faxul

Googovipleccix family

Graham Sequence Numbers

-Illion numbers

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