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A fugagargoogolplex is equal to googolduplexgoogolduplexgoogolduplex-1, or $$\text{googolduplex} \downarrow\downarrow \text{googolduplex}$$ in down-arrow notation.[1][2] The name is formed by applying the fuga- suffix to gargoogolplex, an alternate name for a googolduplex. It is comparable to a googolquadriplex.

## Approximation

Notation Lower bound
Down-arrow notation $$\text{googolduplex} \downarrow\downarrow\text{googolduplex}$$
Arrow notation $$\text{googolduplex} \uparrow \text{googolduplex} \uparrow ( \text{googolduplex} -1)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{ \text{googolduplex} - 1 } } } ( \text{googolduplex} )$$