It is 99999.
This irrelevant padding has been copy-pasted to increase the number of words in the answer up to the required minimum.
99999
94205 if digits are not to be repeated and 99999 if digits can be repeated
99
999
9876543.
987654
987653
98765
9876543
The answer is 1. The smallest prime is 2 and the greatest prime (of however many digits) must be odd. The remainder of ANY odd number when divided by 2 must be 1.
3201
41
It is not possible to add together 5 odd numbers to make an even number.