Step 1: Divide the number into separate digits:
79660 => 7 9 6 6 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 9 = 2
9 to 6 = 3
6 to 6 = 0
6 to 0 = 6
0 to 7 = 7
Step 3: Combine the filters to a string:
2 3 0 6 7 = 23067