Step 1: Divide the number into separate digits:
66528 => 6 6 5 2 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 6 = 0
6 to 5 = 1
5 to 2 = 3
2 to 8 = 6
8 to 6 = 2
Step 3: Combine the filters to a string:
0 1 3 6 2 = 01362