Step 1: Divide the number into separate digits:
80163 => 8 0 1 6 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 0 = 8
0 to 1 = 1
1 to 6 = 5
6 to 3 = 3
3 to 8 = 5
Step 3: Combine the filters to a string:
8 1 5 3 5 = 81535