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Fzninety is equal to $$90^{90}$$ = $$90\uparrow\uparrow2$$ ≈ $$7.67113\times10^{175}$$.

Full decimal expansion:

76177348045866392339289727720615561750424801402395196724001565744957137343033038019601000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Etymology

Fzninety is made out of the Fz- prefix and ninety, which ends up becoming $$90^{90}$$ when concatenated backwards, or 90 to the power of itself.