The number system we commonly used, known as the decimal system, has 10 digits (0 to 9). It is possible to use other number systems, with a different number of digits. Any numbering system based on the same principle (the principle of place-value) must use 2 or more digits.
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1
If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
Different countries have different number of digits. You need to be more specific.
16
A repeating decimal is a rational number. Its value is(the repeating set of digits)/(as many 9s as there are digits above).