One trecentretriginmilliamilliamilliatrecentretriginmilliamilliatrecentretriginmilliatrecenduotrigintillion is 10999,999,999,999.

It is also equal to 101012-1.

Approximations

Notation Lower bound Upper bound
Scientific notation \(1\times10^{999999999999}\)
Arrow notation \(10\uparrow999999999999\)
Down-arrow notation \(767\downarrow\downarrow5\) \(10\downarrow\downarrow13\)
Steinhaus-Moser Notation 10[3][3] 11[3][3]
Copy notation 9[9[12]] 1[1[13]]
H* function H(333H(2)) H(334H(2))
Taro's multivariable Ackermann function A(3,A(3,38)) A(3,A(3,39))
Pound-Star Notation #*((1))*(9)*5 #*((1))*(47)*3
BEAF {10,999999999999}
Hyper-E notation E999999999999
Bashicu matrix system (0)(1)[6] (0)(1)[7]
Hyperfactorial array notation (14!)! (15!)!
Fast-growing hierarchy \(f_2(f_2(36))\) \(f_2(f_2(37))\)
Hardy hierarchy \(H_{\omega^22}(36)\) \(H_{\omega^22}(37)\)
Slow-growing hierarchy \(g_{\omega^{\omega^{\omega+1}9+\omega^\omega9}}(10)\) \(g_{\omega^{\omega^{\omega+2}}}(10)\)

Sources

1. http://www.isthe.com/cgi-bin/chongo/number.cgi

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