Step 1: Divide the number into separate digits:
17086 => 1 7 0 8 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
1 to 7 = 6
7 to 0 = 7
0 to 8 = 8
8 to 6 = 2
6 to 1 = 5
Step 3: Combine the filters to a string:
6 7 8 2 5 = 67825