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Fzsixty is equal to $$60^{60}$$ = $$60\uparrow\uparrow2$$ ≈ $$4.88736\times10^{106}$$.

Full decimal expansion:

48873677980689257489322752273774603865660850176000000000000000000000000000000000000000000000000000000000000

## Etymology

Fzsixty is made out of the Fz- prefix and sixty, which ends up becoming $$60^{60}$$ when concatenated backwards, ergo, 60 to the power of itself.