Xonillion

The xonillion is equal to \(10^{3 \times 10^{27}+3}\), or \(10^{3\text{ octillion }3}\). The term was coined by Jonathan Bowers. It is 3,000,000,000,000,000,000,000,000,004 digits long.

Xonillion is also known as one milliamilliamilliamilliamilliamilliamilliamilliamilliatillion 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 "xona-".