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Fzeighty is equal to $$80^{80}$$ = $$80\uparrow\uparrow2$$ ≈ $$1.76685\times10^{152}$$.

Full decimal expansion:

176684706477838432958329750074291851582748389687561895812160620129261977600000000000000000000000000000000000000000000000000000000000000000000000000000000

## Etymology

Fzeighty is made out of the Fz- prefix and eighty, which ends up becoming $$80^{80}$$ when concatenated backwards, or 80 to the power of itself.