Question

What is the last number

Answer 1

There is no last number. If anyone ever comes in and tells you that he has
the highest number, ask him to let you see it. When he shows it to you, take it,
and gently add '1 ' to it. That will give you a number that's bigger than his number,
which he thought was the highest one, but really isn't.

Answer 2

There is no last number ... becuz its infinite