555

Do you mean the number 555, or something else (e.g., a 555 timer, or a topic for a specific exam)? If you want math facts about 555, here are quick ones you can memorize:

• Prime factorization: 555 = 3 × 5 × 37
• Divisible by: 3, 5, 15, 37, 111, 185, 555
• Digit sum: 5+5+5 = 15; digital root = 6
• Binary: 555 = 1000101011₂
• Roman numeral: DLV
• Harshad number: 555 ÷ 15 = 37

If you want an exam-style problem, I can generate one (e.g., factorization, divisibility, or a quick base-conversion question). Let me know the subject and level.