Step 1: Divide the number into separate digits:
73655 => 7 3 6 5 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 3 = 4
3 to 6 = 3
6 to 5 = 1
5 to 5 = 0
5 to 7 = 2
Step 3: Combine the filters to a string:
4 3 1 0 2 = 43102