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The duecillion is equal to $$10^{3 \times 10^{36}+3}$$, or $$10^{3\text{ undecillion }3}$$.[1] The term was coined by Jonathan Bowers.

### Etymology

The name of this number is based on the suffix "-illion" and the prefix "dueco-".

### Approximations in other notations

Notation Lower bound Upper bound
Arrow notation $$1000\uparrow(1+10\uparrow36)$$
Down-arrow notation $$1000\downarrow\downarrow13$$ $$255\downarrow\downarrow16$$
Steinhaus-Moser Notation 24[3][3] 25[3][3]
Copy notation 2[2[37]] 3[3[37]]
H* function H(H(11))
Taro's multivariable Ackermann function A(3,A(3,119)) A(3,A(3,120))
Pound-Star Notation #*((1))*(2,4,3,1)*4 #*((1))*(3,4,3,1)*4
BEAF {1000,1+{10,36}}
Hyper-E notation E(3+3E36)
Bashicu matrix system (0)(1)[119] (0)(1)[120]
Hyperfactorial array notation (31!)! (32!)!
Fast-growing hierarchy $$f_2(f_2(116))$$ $$f_2(f_2(117))$$
Hardy hierarchy $$H_{\omega^22}(116)$$ $$H_{\omega^22}(117)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega3+6}3+3}}(10)$$

### Sources

1. Illion Numbers by Jonathan Bowers