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The nonagintyllion is equal to $$10^{2^{92}} = 10^{4,951,760,157,141,521,099,596,496,896}$$ in the myriad system[1], or 10 squared 92 times.

### ApproximationsEdit

Notation Lower bound Upper bound
Arrow notation $$10\uparrow2\uparrow92$$
Down-arrow notation $$532\downarrow\downarrow11$$ $$190\downarrow\downarrow13$$
Steinhaus-Moser Notation 20[3][3] 21[3][3]
Copy notation 4[4[28]] 5[5[28]]
Chained arrow notation $$10→(2→92)$$
H* function H(H(8)) H(2H(8))
Taro's multivariable Ackermann function A(3,A(3,90)) A(3,A(3,91))
Pound-Star Notation #*((1))*(4,2,5)*4 #*((1))*(3,4,1)*5
BEAF {10,{2,92}}
Hyper-E notation EE[2]92
Bashicu matrix system (0)(1)[90] (0)(1)[91]
Hyperfactorial array notation (25!)! (26!)!
Strong array notation s(10,s(2,92))
Fast-growing hierarchy $$f_2(f_2(87))$$ $$f_2(f_2(88))$$
Hardy hierarchy $$H_{\omega^22}(87)$$ $$H_{\omega^22}(88)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega2+7}4}}(10)$$ $$g_{\omega^{\omega^{\omega2+7}5}}(10)$$

1. [1]