In normal arithmetic there are only 10 digits, not 11. Any set of 11 characters can represent 11 digits.
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8-11 digits
11 digits.
It you add up all the digit in the number they will total 11. For example the number 425 has digits that sum to 11. (4 + 2 + 5 = 11)
10 digits are numbers in the billions.
A prime number with identical digits is 11.