555

Do you mean the number 555? If so, here are a few quick facts you might find handy for exams:

• Prime factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Number of divisors: 8
• Sum of all divisors: 912 (so sum of proper divisors = 912 − 555 = 357)

If you’re working on a specific problem, share the statement and I’ll walk you through it. Also, if you meant something else (e.g., a code, a Thai “555” meaning laughter, etc.), let me know.