Number don't have maximum amount of characters they have a maximum size. In microflow it's never possible to use any number higher than these numbers (microflow should always be using a long)

The maximum value that is allowd in an integer is: 2,147,483,647
And before you ask, a long has a maximum value of: 9,223,372,036,854,775,807

that is the minimum value for both datatypes as well