The enneicosillion is equal to \(10^{3\times 10^{87}+3}\) or \(10^{3\text{ octovigintillion }3}\).[1] It is defined using Sbiis Saibian's generalization of Jonathan Bowers' -illion system.


Notation Lower bound Upper bound
Arrow notation \(1000\uparrow(1+10\uparrow87)\)
Down-arrow notation \(1000\downarrow\downarrow30\) \(34\downarrow\downarrow58\)
Steinhaus-Moser Notation 50[3][3] 51[3][3]
Copy notation 2[2[88]] 3[3[88]]
H* function H(H(28))
Taro's multivariable Ackermann function A(3,A(3,289)) A(3,A(3,290))
Pound-Star Notation #*((1))*(7,6,5,5,4)*6 #*((1))*(8,6,5,5,4)*6
BEAF {1000,1+{10,87}}
Hyper-E notation E(3+3E87)
Bashicu matrix system (0)(1)[16] (0)(1)[17]
Hyperfactorial array notation (62!)! (63!)!
Fast-growing hierarchy \(f_2(f_2(284))\) \(f_2(f_2(285))\)
Hardy hierarchy \(H_{\omega^22}(284)\) \(H_{\omega^22}(285)\)
Slow-growing hierarchy \(g_{\omega^{\omega^{\omega8+7}3+3}}(10)\)


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