555

Do you mean the number 555 (math) or something else (e.g., the 555 timer IC)? If you’re after math facts, here are quick notes:

• Factorization: 555 = 3 × 5 × 37 = 15 × 37
• Divisibility: divisible by 3, 5, and 15
• Decimal properties: repdigit palindrome (555)
• Roman numeral: DLV
• Binary/Hex: binary 10000101011, hex 0x22B
• Quick problem ideas: (a) verify 555 = 3 × 5 × 37, (b) compute 555 mod 7, (c) convert 555 to base 3

Would you like me to tailor to a particular course topic or provide a few practice questions?