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The septuagintyllion is equal to $$10^{2^{72}} = 10^{4,722,366,482,869,645,213,696}$$ in the myriad system[1], or 10 squared 72 times. It is equal to one followed by 4,722,366,482,869,645,213,696 (or approx. 5 sextillion) zeros. It is 272+1 digits long.

## Names in -illion systems

In the short scale, it is also called:

According to Landon Curt Noll's The English name of a number, septuagintyllion is also known as:

## Approximations in other notations

Notation Lower bound Upper bound
Scientific notation $$10^{4,722,366,482,869,645,213,696}$$
Arrow notation $$10\uparrow2\uparrow72$$
Down-arrow notation $$453\downarrow\downarrow9$$ $$61\downarrow\downarrow13$$
Steinhaus-Moser Notation 16[3][3] 17[3][3]
Copy notation 4[4[22]] 5[5[22]]
H* function H(H(6)) H(2H(6))
Taro's multivariable Ackermann function A(3,A(3,70)) A(3,A(3,71))
Pound-Star Notation #*((1))*(2,1,6)*3 #*((1))*(3,1,6)*3
BEAF {10,{2,72}}
Hyper-E notation EE[2]72
Bashicu matrix system (0)(1)[8] (0)(1)[9]
Hyperfactorial array notation (21!)! (22!)!
Fast-growing hierarchy $$f_2(f_2(67))$$ $$f_2(f_2(68))$$
Hardy hierarchy $$H_{\omega^22}(67)$$ $$H_{\omega^22}(68)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega2+1}4}}(10)$$ $$g_{\omega^{\omega^{\omega2+1}5}}(10)$$