Step 1: Divide the number into separate digits:
65118 => 6 5 1 1 8
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 1 = 0
1 to 8 = 7
8 to 6 = 2
Step 3: Combine the filters to a string:
1 4 0 7 2 = 14072