Step 1: Divide the number into separate digits:
98643 => 9 8 6 4 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 8 = 1
8 to 6 = 2
6 to 4 = 2
4 to 3 = 1
3 to 9 = 6
Step 3: Combine the filters to a string:
1 2 2 1 6 = 12216