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The duocennovemnonagintillion is equal to 10900 in America or 101,794 in France and Germany.

Aarex Tiaokhiao calls this number tricentillion. He also gave the names noohol and 900-noogol, referring to the short scale value of this number.

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{900}$$
Arrow notation $$10\uparrow900$$
Steinhaus-Moser Notation 353 354
Copy notation 9 1
Taro's multivariable Ackermann function A(3,2986) A(3,2987)
Pound-Star Notation #*((53))*18 #*((54))*18
BEAF {10,900}
Hyper-E notation E900
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)(0) (0)(0)(0)(0)(0)(0)(0)(0)
Hyperfactorial array notation 411! 412!
Fast-growing hierarchy $$f_2(2\,978)$$ $$f_2(2\,979)$$
Hardy hierarchy $$H_{\omega^2}(2\,978)$$ $$H_{\omega^2}(2\,979)$$
Slow-growing hierarchy $$g_{\omega^{\omega^29}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{1\,794}$$
Arrow notation $$10\uparrow1\,794$$
Steinhaus-Moser Notation 639 640
Copy notation 9 1
Taro's multivariable Ackermann function A(3,5956) A(3,5957)
Pound-Star Notation #*((613))*24 #*((614))*24
BEAF {10,1794}
Hyper-E notation E1,794
Bashicu matrix system (0)(1) (0)(1)
Hyperfactorial array notation 736! 737!
Fast-growing hierarchy $$f_2(5\,947)$$ $$f_2(5\,948)$$
Hardy hierarchy $$H_{\omega^2}(5\,947)$$ $$H_{\omega^2}(5\,948)$$
Slow-growing hierarchy $$g_{\omega^{\omega^3+\omega^27+\omega9+4}}(10)$$

## Sources

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