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The quadryllion is equal to $$10^{64}$$ in the myriad system[1][2], or 10 squared 6 times.

It is also called fukashigi (不可思議 written in Japanese characters, means "inconceivable").[3][4] The word is in Buddhism's sutra, and it was adopted in Chinese counting system and in Japanese counting system.

## Decimal expansion

10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{64}$$
Arrow notation $$10\uparrow64$$
Steinhaus-Moser Notation 39[3] 40[3]
Copy notation 9[64] 1[65]
Taro's multivariable Ackermann function A(3,209) A(3,210)
Pound-Star Notation #*(4,2,8,0,1,3)*7 #*(5,2,8,0,1,3)*7
BEAF {10,64}
Hyper-E notation E64
Bashicu matrix system (0)(0)(0)(0)[10000]
Hyperfactorial array notation 49! 50!
Fast-growing hierarchy $$f_2(204)$$ $$f_2(205)$$
Hardy hierarchy $$H_{\omega^2}(204)$$ $$H_{\omega^2}(205)$$
Slow-growing hierarchy $$g_{\omega^{\omega6+4}}(10)$$