Step 1: Divide the number into separate digits:
89916 => 8 9 9 1 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 9 = 1
9 to 9 = 0
9 to 1 = 8
1 to 6 = 5
6 to 8 = 2
Step 3: Combine the filters to a string:
1 0 8 5 2 = 10852