The greatest 4-digit number with no repeated digits is... 9876
9876543
98,764
98765
987653
The greatest 4-digit number with no repeated digits is... 9876
98,764
9876543.
987654
98,764
9876543
98,764
98765
987653
94205 if digits are not to be repeated and 99999 if digits can be repeated
The largest ten digit number with no repeated digits is '9876543210'.
It is 9998, or if the digits can't be repeated, it is 9876.