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Fzseventy is equal to $$70^{70}$$ = $$70\uparrow\uparrow2$$ ≈ $$1.43504\times10^{129}$$.

Full decimal expansion:

1435036016098684342856030763566710717400773837392460666392490000000000000000000000000000000000000000000000000000000000000000000000

## Etymology

Fzseventy is made out of the Fz- prefix and seventy, which ends up becoming $$70^{70}$$ when concatenated backwards, or 70 to the power of itself.