What number is the biggest?

Is ∞ the biggest number?

There is no biggest, last number … except infinity. Except infinity isn't a number. But some infinities are literally bigger than others.

How much is infinite?

infinity, the concept of something that is unlimited, endless, without bound. The common symbol for infinity, ∞, was invented by the English mathematician John Wallis in 1655. Three main types of infinity may be distinguished: the mathematical, the physical, and the metaphysical.