555

Do you mean:

• The number 555 (math tricks, bases, factorization, etc.)
• The Roman numeral 555 (DLV)
• The 555 timer IC (electronics)
• The Thai slang “555” meaning laughter

If you’re prepping for exams, I can tailor it. For a quick start, here are a few math-minded facts about 555:

• Prime factorization: 555 = 3 × 5 × 37
• Binary: 555 in binary = 1000101011
• Hexadecimal: 0x22B
• Octal: 1053
• Digit sum: 5+5+5 = 15; 555 is divisible by 3 and by 5
• In Roman numerals: 555 = DLV

Which one would you like to focus on, and what kind of help (explanation, practice problems, quick conversions) do you want? If you’d like, I can give you a short exam-style problem right away.