555

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Quick facts about 555 (decimal):

• Factorization: 555 = 3 × 5 × 37
• Positive divisors: 1, 3, 5, 15, 37, 111, 185, 555 (eight divisors)
• Sum of digits: 5 + 5 + 5 = 15; digital root = 6
• Binary: 1000101011
• Octal: 1053
• Hexadecimal: 0x22B
• Remainder mod 7: 555 mod 7 = 2

Quick practice prompts (exam-style):

1. How many positive divisors does 555 have? (Answer: 8)
2. Convert 555 to base 2, base 8, and base 16. (Binary: 1000101011; Octal: 1053; Hex: 0x22B)
3. Compute 555 mod 7. (Answer: 2)
4. Find the prime factorization of 555 and list the divisors. (Factorization as above; divisors as above)

Would you like me to generate a longer set of problems, or tailor to a specific topic (number theory, modular arithmetic, base conversions, etc.)?