555

Do you mean the number 555 (math), the 555 timer IC (electronics), or something else?

If you want quick math facts about 555:

• Factorization: 555 = 3 × 5 × 37
• Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Divisible by: 3 and 5 (sum of digits is 15; ends with 5)
• Roman numeral: DLV
• Binary: 1000101011
• Base-3 representation: 202120_3

Tell me which topic you’re studying (math, electronics, etc.), and I can tailor explanations or practice problems.