Sexmilliaquingentsexagintillion 

Derived from the Latin name for 6560, this word refers to an unthinkably large number that would take years to type. This number is most commonly written as 10^(19683). This word comes from John Horton Conway and Landon Curt's number naming system in powers of 10. You could in theory, get a number with a much larger name than this.

"What's your favourite number?"

"70 Sexmilliaquingentsexagintillion!"

"Why are we friends? Your such a loser, you could have just said a comprehensible number, why do you do this?"

Sexmilliaquingentsexagintillion by Louw (snakes) March 2, 2021