555

Here are a few quick facts about the number 555, in case you’re practicing for exams:

• Prime factorization: 555 = 3 × 5 × 37
• Number of positive divisors: (1+1)(1+1)(1+1) = 8
• Positive divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Sum of divisors σ(555): (1+3)(1+5)(1+37) = 4 × 6 × 38 = 912
• Euler’s totient φ(555): 555 × (1−1/3) × (1−1/5) × (1−1/37) = 288

Would you like me to generate some exam-style problems (e.g., factorization, divisor sums, or modular arithmetic) using 555? Or is there a specific context you had in mind?