Are there any ultra long numbers?

Answer 1

No matter what you mean with "ultra long" - you can make numbers as large as you like. There is no last number. For instance, if you have a very large number, you can add 1 to it, to make an even larger number. Or you can attach a zero at the end.

Answer 2

The answer depends on what you mean by ultra long. There are infinitely many numbers which have decimal representations which never end. These could be considered ultra long. In that case, the number of ultra long numbers is infinitely greater than non-ultra long numbers.