a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol)
The number 10^(10¹⁰⁰) or 10^( text )googol, ten to the power of a googol.
The word "googolplex" was coined in 1920 by American mathematician Milton Sirotta, combining "googol" with the suffix "-plex." It was first published and defined in Edward Kasner's book Mathematics and the Imagination in 1940.