The dueicosillion is equal to \(10^{3\left(10^{66}\right)+3}\) or \(10^{3\text{ unvigintillion }3}\).[1] The term was coined by Aarex Tiaokhiao.
Approximations
| Notation | Lower bound | Upper bound |
|---|---|---|
| Arrow notation | \(1000\uparrow(1+10\uparrow66)\) | |
| Down-arrow notation | \(1000\downarrow\downarrow23\) | \(742\downarrow\downarrow24\) |
| Steinhaus-Moser Notation | 40[3][3] | 41[3][3] |
| Copy notation | 2[2[67]] | 3[3[67]] |
| H* function | H(H(21)) | |
| Taro's multivariable Ackermann function | A(3,A(3,219)) | A(3,A(3,220)) |
| Pound-Star Notation | #*((1))*(0,5,0,4,1)*5 | #*((1))*(1,5,0,4,1)*5 |
| BEAF | {1000,1+{10,66}} | |
| Hyper-E notation | E(3+3E66) | |
| Bashicu matrix system | (0)(1)[14] | (0)(1)[15] |
| Hyperfactorial array notation | (50!)! | (51!)! |
| Fast-growing hierarchy | \(f_2(f_2(214))\) | \(f_2(f_2(215))\) |
| Hardy hierarchy | \(H_{\omega^22}(214)\) | \(H_{\omega^22}(215)\) |
| Slow-growing hierarchy | \(g_{\omega^{\omega^{\omega6+6}3+3}}(10)\) | |
