If zero is permitted as the first digit then the number of combinations is 10 x 10 x 10 x 10 x 10 = 100000
If zero is not permitted then the number of combination is :-
9 x 10 x 10 x 10 x 10 = 90000
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It is difficult to interpret exactly what you are trying to ask. If you allow your five digit number to have leading zeroes and do not allow negative numbers, then 00000 - 99999 = -99999 is the smallest number. If you do allow negative 5 digit numbers, then (-99999) - 99999 = -199998 is the smallest number.
99997
There are 2000 such numbers.
9876543210
9