Mecillion

The mecillion is equal to \(10^{3\left(10^{33}\right)+3}\), or \(10^{3\text{ decillion }3}\). The term was coined by Jonathan Bowers. It is 3,000,000,000,000,000,000,000,000,000,000,004 digits long.

Mecillion is also known as one milliamilliamilliamilliamilliamilliamilliamilliamilliamilliamilliatillion 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 "meco-".