Step 1: Divide the number into separate digits:
96649 => 9 6 6 4 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 6 = 3
6 to 6 = 0
6 to 4 = 2
4 to 9 = 5
9 to 9 = 0
Step 3: Combine the filters to a string:
3 0 2 5 0 = 30250