555

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

If you want quick math facts about 555:

• Prime factorization: 555 = 3 × 5 × 37
• Number of divisors: 8 Divisors: 1, 3, 5, 15, 37, 111, 185, 555
• Sum of divisors: 912
• Binary: 1000101011₂
• Hex: 0x22B
• Roman numeral: DLV

Want me to turn this into a quick practice problem, or would you like a refresher on the 555 timer circuit (astable/monostable) instead?