Step 1: Divide the number into separate digits:
86050 => 8 6 0 5 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 6 = 2
6 to 0 = 6
0 to 5 = 5
5 to 0 = 5
0 to 8 = 8
Step 3: Combine the filters to a string:
2 6 5 5 8 = 26558