555

Here are quick facts about the number 555 (decimal):

• Prime factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Number of divisors: 8
• Sum of all divisors: 912 (sum of proper divisors: 912 − 555 = 357)
• Binary: 1000101011
• Hexadecimal: 0x22B
• Roman numerals: DLV
• Not a triangular number; not a perfect square.

If you’d like, I can generate an exam-style mini-problem set using 555 (e.g., factorization, divisor counting, modular arithmetic), or explain any of these facts in more detail. What would you prefer?