555

Do you want something specific about 555? Here are quick ideas and facts to help with exam prep:

• Prime factorization: 555 = 3 × 5 × 37
• Divisibility: divisible by 3 (sum of digits 5+5+5=15), divisible by 5 (ends with 5)
• Roman numeral: DLV
• Binary: 1000101011
• Hexadecimal: 0x22B
• Base-3 representation: 202120_3
• Base-10 to base-3 check: 555_10 = 2·3^5 + 0·3^4 + 2·3^3 + 1·3^2 + 2·3^1 + 0·3^0
• Euler’s totient: φ(555) = 288
• Number of divisors: since 555 = 3·5·37, d(555) = (1+1)(1+1)(1+1) = 8

If you’d like, I can turn this into a practice problem (e.g., find divisors, or convert to another base) or tailor it to a specific topic. What would you prefer?