(10^138). This is an immensely massive number!
A Quinquadragintillionaire is someone whos assets, net worth or wealth is 1 or more Quinquadragintillion. It is unlikely anyone will ever be a true Quinquadragintillionaire. If you want to be a Quinquadragintillionaire, play Tap Tales!
Quinquadragintillion is not the largest number.
best describes the largest possible number - if there even is one! We cannot comprehend what the largest number actually is.