Googolvekaplex

A googolvekaplex is equal to a googol followed by a nonillion plexes.[1] In Hyper-E notation it can be written E100#(nonillion+1) and as power tower, 1010 ... 10 100   (with octillion 10's).

Etymology Edit
The name of this number is based on SI prefix "xenna-" and the number "googolplex".