NA

4867 → 4 + 8 + 6 + 7 = 25, which is divisible by 5.
5555 → 5 + 5 + 5 + 5 = 20, which is divisible by 5.
6243 → 6 + 2 + 4 + 3 = 15, which is divisible by 5.
6655 → 6 + 6 + 5 + 5 = 22, which is not divisible by 5.