555

Here are some quick notes and a small practice set you can use for exam prep around the number 555.

Quick facts

• Decimal digits: 5, 5, 5 (555 = 5×100 + 5×10 + 5).
• Prime factorization: 555 = 3 × 5 × 37.
• Divisibility: divisible by 3 (sum of digits = 15), divisible by 5, but not by 9 or 11.
• In Roman numerals: DLV.
• Binary: 555 = 1000101011₂.
• Base-6 representation: 555 = 2323₆.
• Base-5 representation: 555 = 4210₵5.

Mini practice set (answers after questions)

1. What is the prime factorization of 555?

• Answer: 3 × 5 × 37

2. Is 555 divisible by 9? Is it divisible by 11?

• Answer: Not divisible by 9; not divisible by 11.

3. Convert 555 to base 2 and base 6.

• Answer: 555 = 1000101011₂ and 555 = 2323₆

4. Write 555 in base 5.

• Answer: 4210₵5

5. Express 555 as a sum of two consecutive integers.

• Answer: 277 + 278

If you want, I can tailor more questions to a specific topic (e.g., number theory, modular arithmetic, base conversions) or generate a longer quiz with varied difficulty. Also, if you meant something else by “555” (like a shorthand in Thai slang), tell me and I’ll adapt.