Step 1: Divide the number into separate digits:
65287 => 6 5 2 8 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 5 = 1
5 to 2 = 3
2 to 8 = 6
8 to 7 = 1
7 to 6 = 1
Step 3: Combine the filters to a string:
1 3 6 1 1 = 13611