555

Not sure what you want with "555." Here are quick math-related facts in case that helps for exam prep:

• Prime factorization: 555 = 3 × 5 × 37
• Divisible by: 3, 5, and 15 (but not by 2, 4, 6, 7, …)
• Harshad number: 555 is divisible by the sum of its digits (5+5+5 = 15), and 555 / 15 = 37
• Roman numeral: 555 = DLV
• Binary: 555 = 1000101011₂
• Hexadecimal: 555 = 0x22B
• Digital root: 5+5+5 = 15 → 1+5 = 6 (digital root 6)
• Moduli to know: 555 ≡ 6 (mod 9); 555 ≡ 5 (mod 11)

If you want, I can turn this into a short 5-question mini-quiz or give step-by-step solutions for a couple of quick practice problems (e.g., compute 555^2, gcd(555, 150), convert to binary/hex, etc.). What would you like to focus on?