555

Not sure what you want with “555.” Do you mean math properties, a base conversion, or something else (like the 555 timer in electronics)? Here are some quick facts you can use in exams:

• Decimal: 555
• Digit sum: 5+5+5 = 15
• Divisibility: divisible by 3 and by 5, hence by 15
• Prime factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Binary: 1000101011_2
• Hex: 0x22B
• Octal: 1053_8
• Base 7: 1422_7
• Base 3: 202120_3
• Roman numeral: DLV

If you want, I can turn these into exam-style questions or apply them to a specific topic (e.g., modular arithmetic, number theory, or base conversions). Which direction would you like?