Step 1: Divide the number into separate digits:
36068 => 3 6 0 6 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 6 = 3
6 to 0 = 6
0 to 6 = 6
6 to 8 = 2
8 to 3 = 5
Step 3: Combine the filters to a string:
3 6 6 2 5 = 36625