Step 1: Divide the number into separate digits:
01759 => 0 1 7 5 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 1 = 1
1 to 7 = 6
7 to 5 = 2
5 to 9 = 4
9 to 0 = 9
Step 3: Combine the filters to a string:
1 6 2 4 9 = 16249