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Googoloctiplex, googoloktoplex, or googolplexplexplexplexplexplexplexplex is equal to E100#9 = EEEEEEEEE100  in Hyper-E notation.[1]

It is also equal to $$^{10}10^{2}$$ = 101010101010101010100, or one followed by googolseptiplex (googolplexplexplexplexplexplexplex) zeros. It is 1010101010101010100+1 digits long.

Writing down the full decimal expansion would take 1010101010101010100-6 books of 400 pages each, with 2,500 digits on each page (except for the first, which would have 2,501).

## Etymology

The name of this number is based on Latin infix "octi-" and the number "googolplex".

## Approximations in other notations

Notation Approximation
Up-arrow notation $$57 \uparrow \uparrow 10$$
Chained arrow notation $$57 \rightarrow 10 \rightarrow 2$$
Hyper-E notation $$\textrm{E}100\#9$$ (exact)
Hyperfactorial array notation $$13!1$$
BEAF $$\{57,10,2\}$$
Fast-growing hierarchy $$f^9_2(326)$$
Hardy hierarchy $$H_{\omega^29}(324)$$
Slow-growing hierarchy $$g_{\varepsilon_0}(10)$$