Step 1: Divide the number into separate digits:
32175 => 3 2 1 7 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 2 = 1
2 to 1 = 1
1 to 7 = 6
7 to 5 = 2
5 to 3 = 2
Step 3: Combine the filters to a string:
1 1 6 2 2 = 11622