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Megafugagoogolplex is equal to googolplex↑↑googolplex using up-arrow notation[1]. It is equal to {googolplex,googolplex,2} in BEAF. It is equal to a power tower of a googolplex googolplexes, and it can be shown to fall between E(100+10100)#(1010100) and E(101+10100)#(1010100) in Hyper-E notation.[2] The name was formed by combining "googolplex" with the megafuga- prefix.

Unknown95387 calls this number hypergoogolplex.[3]

## Approximation

Notation Approximation
Arrow notation $$\text{googolplex}\uparrow\uparrow\text{googolplex}$$
Fast-growing hierarchy $$f_3(\text{googolplex})$$
Hardy hierarchy $$H_{\omega^3}(\text{googolplex})$$
Slow-growing hierarchy $$g_{\varepsilon_0}(\text{googolplex})$$
Steinhaus-Moser Notation $$(\text{googolplex}-1)[4]$$ lower bound $$\text{googolplex}[4]$$ upper bound
Strong array notation s(\text{googolplex},\text{googolplex},2)
Bowers Exploding Array Function $$\{ \text{googolplex}, \text{googolplex}, 2\}$$
Bird's array notation $$\{ \text{googolplex}, \text{googolplex}, 2\}$$
Hyperfactorial array notation $$\text{googolplex}!1$$ lower bound $$(\text{googolplex}+1)!1$$ upper bound
Chained arrow notation $$\text{googolplex}\rightarrow\text{googolplex}\rightarrow 2$$