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An octoquadragintillion is equal to $$10^{147}$$ or $$10^{288}$$ in France and Germany by Conway-Wechsler system.[1][2][3][4][5]

In the long scale which is commonly used in France and Germany, $$10^{147}$$ is called quattuorvigintilliard.

## Decimal expansion

In short scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

In long scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{147}$$
Arrow notation $$10\uparrow147$$
Steinhaus-Moser Notation 77[3] 78[3]
Copy notation 9[147] 10[74]
Taro's multivariable Ackermann function A(3,485) A(3,486)
Pound-Star Notation #*(13,12,11,12,5,1,5,6)*10 #*(14,3,9,6,4,0,3,1)*11
BEAF {10,147}
Hyper-E notation E147
Bashicu matrix system (0)(0)(0)(0)(0)[39241] (0)(0)(0)(0)(0)[39242]
Hyperfactorial array notation 94! 95!
Fast-growing hierarchy $$f_2(479)$$ $$f_2(480)$$
Hardy hierarchy $$H_{\omega^2}(479)$$ $$H_{\omega^2}(480)$$
Slow-growing hierarchy $$g_{\omega^{\omega^2+\omega4+7}}(10)$$

For logn scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{288}$$
Arrow notation $$10\uparrow288$$
Steinhaus-Moser Notation 135[3] 136[3]
Copy notation 9[288] 1[289]
Taro's multivariable Ackermann function A(3,953) A(3,954)
Pound-Star Notation #*((60))*11 #*((61))*11
BEAF {10,288}
Hyper-E notation E288
Bashicu matrix system (0)(0)(0)(0)(0)(0)[31622] (0)(0)(0)(0)(0)(0)[31623]
Hyperfactorial array notation 161! 162!
Fast-growing hierarchy $$f_2(946)$$ $$f_2(947)$$
Hardy hierarchy $$H_{\omega^2}(946)$$ $$H_{\omega^2}(947)$$
Slow-growing hierarchy $$g_{\omega^{\omega^22+\omega8+8}}(10)$$

## List of prefixed numbers derived from quadragintillion

Name Short scale Long scale