Step 1: Divide the number into separate digits:
65169 => 6 5 1 6 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 5 = 1
5 to 1 = 4
1 to 6 = 5
6 to 9 = 3
9 to 6 = 3
Step 3: Combine the filters to a string:
1 4 5 3 3 = 14533