Step 1: Divide the number into separate digits:
11066 => 1 1 0 6 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
1 to 1 = 0
1 to 0 = 1
0 to 6 = 6
6 to 6 = 0
6 to 1 = 5
Step 3: Combine the filters to a string:
0 1 6 0 5 = 01605