555

Not sure what you want about "555"—here are a few quick angles. Tell me which one you’d like, or share your exact question.

• Math facts:

  • 555 = 3 × 5 × 37
  • Also 555 = 15 × 37
  • Divisible by 3, 5, and 15

• Number bases:

  • Binary: 555 = 1000101011₂
  • Hexadecimal: 555 = 0x22B

• Roman numerals:

  • 555 = DLV

• Electronics (555 timer IC):

  • Common use: generates pulses in astable or monostable modes
  • Quick formula (astable): f ≈ 1.44 / ((R1 + 2R2) C) [components in seconds]

• Slang:

  • In Thai online slang, 555 means “hahaha” (since 5 is “ha”).

If you have a specific question (e.g., factorization, a base conversion, or a problem involving a 555 timer circuit), share it and I’ll walk you through it.