## FANDOM

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An unvigintiducentillion is equal to $$10^{666}$$ in short scale or $$10^{1326}$$ in long scale.[1][2]

### ApproximationsEdit

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{666}$$
Arrow notation $$10\uparrow666$$
Steinhaus-Moser Notation 273[3] 274[3]
Copy notation 9[666] 1[667]
Taro's multivariable Ackermann function A(3,2209) A(3,2210)
Pound-Star Notation #*((12))*16 #*((13))*16
BEAF {10,666}
Hyper-E notation E666
Bashicu matrix system (0)(1)[8] (0)(1)[9]
Hyperfactorial array notation 320! 321!
Fast-growing hierarchy $$f_2(2201)$$ $$f_2(2202)$$
Hardy hierarchy $$H_{\omega^2}(2201)$$ $$H_{\omega^2}(2202)$$
Slow-growing hierarchy $$g_{\omega^{\omega^26+\omega6+6}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{1326}$$
Arrow notation $$10\uparrow1326$$
Steinhaus-Moser Notation 492[3] 493[3]
Copy notation 9[1326] 1[1327]
Taro's multivariable Ackermann function A(3,4401) A(3,4402)
Pound-Star Notation #*((569))*21 #*((570))*21
BEAF {10,1326}
Hyper-E notation E1326
Bashicu matrix system (0)(1)[9] (0)(1)[10]
Hyperfactorial array notation 570! 571!
Fast-growing hierarchy $$f_2(4392)$$ $$f_2(4393)$$
Hardy hierarchy $$H_{\omega^2}(4392)$$ $$H_{\omega^2}(4393)$$
Slow-growing hierarchy $$g_{\omega^{\omega^3+\omega^23+\omega2+6}}(10)$$