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The googolnoniplex (also known as googolenneaplex, googolnonaplex, or googolplexplexplexplexplexplexplexplexplex) is equal to E100#10 = EEEEEEEEEE100 in Hyper-E notation.[1]

It is also equal to $$^{11}10^{2}$$ = 10101010101010101010100, or a 1 with a googoloctiplex zeroes. It is 101010101010101010100+1 digits long.

Writing down the full decimal expansion would take 101010101010101010100-6 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 prefix "noni-" and the number "googolplex"

## Approximations in other notations

Notation Approximation
Up-arrow notation $$57 \uparrow \uparrow 11$$
Chained arrow notation $$57 \rightarrow 11 \rightarrow 2$$
Hyper-E notation $$\textrm{E}100\#10$$ (exact)
Hyperfactorial array notation $$14!1$$
BEAF $$\{57,11,2\}$$
Fast-growing hierarchy $$f_3(11)$$
Hardy hierarchy $$H_{\omega^2{10}}(324)$$
Slow-growing hierarchy $$g_{\varepsilon_0}(11)$$