555

If you meant the number 555, here are quick exam-friendly facts and quick practice ideas. If you meant something else, tell me.

Quick facts about 555

• Palindrome: 555 reads the same forward and backward.
• Prime factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3, 5, and 15 (555 = 15 × 37); not divisible by 9 or 25.
• base conversions:
  • Binary: 1000101011
  • Hexadecimal: 0x22B
• Roman numeral: DLV
• Related integers:
  • 555 = 15 × 37
  • gcd(555, 666) = 111
  • lcm(555, 666) = 3330
• Number of divisors: since 555 = 3^1 × 5^1 × 37^1, it has (1+1)(1+1)(1+1) = 8 divisors
  • They are: 1, 3, 5, 15, 37, 111, 185, 555

Quick practice questions (exam-style)

1. Find the prime factorization of 555 and list all divisors.
2. Compute gcd(555, 666) and lcm(555, 666).
3. Convert 555 to binary and to hexadecimal.
4. If a number is divisible by 3 and by 5, what is the least common multiple of those divisors for 555? (Hint: use the factorization.)
5. Express 555 in Roman numerals and verify by converting back to decimal.

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