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A sexsexagintillion is equal to 10201 in the short scale, or 10396 in the long scale.[1]

In the long scale which is commonly used in France and Germany, 10201 is called tretrigintilliard.

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{201}$$
Arrow notation $$10\uparrow201$$
Steinhaus-Moser Notation 100[3] 101[3]
Copy notation 9[201] 10[101]
Taro's multivariable Ackermann function A(3,664) A(3,665)
Pound-Star Notation #*((967))*9 #*((968))*9
BEAF {10,201}
Hyper-E notation E201
Bashicu matrix system (0)(0)(0)(0)(0)(0)[1382] (0)(0)(0)(0)(0)(0)[1383]
Hyperfactorial array notation 121! 122!
Fast-growing hierarchy $$f_2(658)$$ $$f_2(659)$$
Hardy hierarchy $$H_{\omega^2}(658)$$ $$H_{\omega^2}(659)$$
Slow-growing hierarchy $$g_{\omega^{\omega^22+1}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{396}$$
Arrow notation $$10\uparrow396$$
Steinhaus-Moser Notation 176[3] 177[3]
Copy notation 9[396] 1[397]
Taro's multivariable Ackermann function A(3,1312) A(3,1313)
Pound-Star Notation #*((4688))*12 #*((4689))*12
BEAF {10,396}
Hyper-E notation E396
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[1240] (0)(0)(0)(0)(0)(0)(0)[1241]
Hyperfactorial array notation 209! 210!
Fast-growing hierarchy $$f_2(1305)$$ $$f_2(1306)$$
Hardy hierarchy $$H_{\omega^2}(1305)$$ $$H_{\omega^2}(1306)$$
Slow-growing hierarchy $$g_{\omega^{\omega^23+\omega9+6}}(10)$$

## List of prefixed numbers derived from sexagintillion

Name Short scale Long scale
unsexagintillion 10186 10366
duosexagintillion 10189 10372
tresexagintillion 10192 10378
quattuorsexagintillion 10195 10384
quinsexagintillion 10198 10390
sexsexagintillion 10201 10396
septensexagintillion 10204 10402
octosexagintillion 10207 10408
novemsexagintillion 10210 10414

## Sources

1. Very big numbers on Skynet