Step 1: Divide the number into separate digits:
61453 => 6 1 4 5 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 1 = 5
1 to 4 = 3
4 to 5 = 1
5 to 3 = 2
3 to 6 = 3
Step 3: Combine the filters to a string:
5 3 1 2 3 = 53123