555

Could you tell me what context you want about 555? Here are common ones. Pick one to dive into, or share your exact problem.

• Math / number theory
  • 555 = 3 × 5 × 37
  • Divisors: 1, 3, 5, 15, 37, 111, 185, 555 (8 divisors)
  • Sum of divisors σ(555) = 912
  • Euler totient φ(555) = 288
  • Representations: decimal 555; binary 1000101011; hex 0x22B
• Electronics (555 timer)
  • In astable mode: f ≈ 1.44 / ((RA + 2 RB) C)
  • High/low times: t_high = 0.693 (RA + RB) C, t_low = 0.693 RB C
  • Monostable pulse width: t ≈ 1.1 R C (depending on configuration)
• Roman numerals
  • 555 = DLV
• Time / angles
  • 555° ≡ 555 − 360 = 195° (mod 360)
• Computing / hex
  • Decimal 555 = hex 0x22B; 0x555 (hex) = 1365 decimal

Tell me which one you want to study or paste your problem, and I’ll tailor the explanation or solve it.