Heptecillion

The heptecillion is equal to \(10^{3\left(10^{51}\right)+3}\) or \(10^{3\text{ sexdecillion }3}\). The term was coined by Jonathan Bowers. It is 3×1051+4 digits long.

Heptecillion is also known as one millia^17tillion 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 "hepteco-".