Fugafour

Fugafour is equal to 44 3 = 464 = 2128 = 22 7, or \(4 \downarrow \downarrow 4\) using down-arrow notation. The name is formed by applying the fuga- prefix to 4. It is approximately 3.4028*1038 using scientific notation, and it is about 340 undecillion in the short scale or 340 sextillion in the long scale.

Decimal expansion
340,282,366,920,938,463,463,374,607,431,768,211,456