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Googolplexplexbang or googolduplexbang is a number that's equal to $$10^{10^{10^{100} } }!$$ or $$\text{googolduplex}!$$.[1]

The name originates from combining googolplexplex (another name for googolduplex) and the -bang suffix, which is commonly used for factorial numbers. For example googolbang is equal to $$10^{100}!$$.

## Approximations

Notation Approximation
Up-arrow notation $$(10\uparrow 10\uparrow 10\uparrow 100)\uparrow\uparrow 2$$