Step 1: Divide the number into separate digits:
60608 => 6 0 6 0 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 0 = 6
0 to 6 = 6
6 to 0 = 6
0 to 8 = 8
8 to 6 = 2
Step 3: Combine the filters to a string:
6 6 6 8 2 = 66682