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A googolquinplex or googolquintiplex or googolpentaplex or googolplexplexplexplexplex[1] is one with a googolquadriplex zeroes after it, or 101010101010100.[2][3] In Hyper-E Notation it can be written E100#6.[4] In down-arrow notation it can also be written $$10 \downarrow\downarrow (10^{10^{10^{10^{100}}}}+1)$$. It is 1010101010100+1 digits long.

Writing down the full decimal expansion would take 1010101010100-6 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 "quin-" and the number "googolplex".

## Approximations in other notations

Notation Approximation
Up-arrow notation $$57 \uparrow \uparrow 7$$
Chained arrow notation $$57 \rightarrow 7 \rightarrow 2$$
Hyper-E notation $$\textrm{E}100\#6$$ (exact)
Hyperfactorial array notation $$10!1$$
BEAF $$\{57,7,2\}$$
Fast-growing hierarchy $$f^6_2(326)$$
Hardy hierarchy $$H_{\omega^2\times 6}(324)$$
Slow-growing hierarchy $$g_{\varepsilon_0}(7)$$