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Megafugaforty is equal to $$40\uparrow\uparrow40$$, or approximately $$E(1.936771688088 \times 10^{64})\#38$$ in the base 10 in Hyper-E notation.

Without using base 10 E#, this number is E(40)1#40

The name is formed by adding the megafuga- prefix to 40.