555

Nice. Do you want something specific with the number 555 (a quick math warm-up), or did you mean something else for your exam prep?

If you want a quick set of facts and a mini-problem set, here are some you can memorize or use:

• Decimal 555; Roman numeral DLV
• Prime factorization: 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555 (8 divisors)
• Sum of divisors: 912; sum of proper divisors: 357 → 555 is a deficient number
• Binary: 1000101011₂; Hex: 0x22B; Octal: 1053₈

If you want, I can turn this into a short practice quiz or apply it to a broader topic (number theory, modular arithmetic, numerical representations, etc.). What would you prefer?