Step 1: Divide the number into separate digits:
71760 => 7 1 7 6 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 1 = 6
1 to 7 = 6
7 to 6 = 1
6 to 0 = 6
0 to 7 = 7
Step 3: Combine the filters to a string:
6 6 1 6 7 = 66167