Octecillion

The octecillion is equal to \(10^{3\left(10^{54}\right)+3}\) or \(10^{3\text{ septendecillion }3}\). The term was coined by Jonathan Bowers. It is 3×1054+4 digits long.

Octecillion is also known as one millia^18tillion according to Landon Curt Noll's The English name of a number.

Etymology
The name of this number is based on the suffix "-illion" and the prefix "octeco-".