555

Do you mean 555 in math/number theory, Roman numerals, or the electronics 555 timer? Here are quick facts in case you need them.

• Decimal to factors: 555 = 3 × 5 × 37
• Prime factorization: 3 × 5 × 37
• Number of divisors: 8 (1, 3, 5, 15, 37, 111, 185, 555)
• Roman numeral: DLV
• Digital sum and root: 5+5+5 = 15 → 1+5 = 6
• Binary: 1000101011
• Hex: 0x22B

If you meant the 555 timer IC (electronics), I can give you the basics or derive the frequency equation for an astable circuit, etc.

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