### 669 and Level 4

Since all its digits are divisible by 3, obviously 669 is divisible by 3.

222 + **223** + 224 = 669. Thus 669 is the sum of 3 consecutive numbers. Prime factor 223 is the middle number in the sum.

Print the puzzles or type the solution on this excel file: 12 Factors 2015-11-02

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- 669 is a composite number.
- Prime factorization: 669 = 3 x 223
- The exponents in the prime factorization are 1 and 1. Adding one to each and multiplying we get (1 + 1)(1 + 1) = 2 x 2 = 4. Therefore 669 has exactly 4 factors.
- Factors of 669: 1, 3, 223, 669
- Factor pairs: 669 = 1 x 669 or 3 x 223
- 669 has no square factors that allow its square root to be simplified. √669 ≈ 25.865034.

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Ricardo shows the solution here:

@findthefactors a nice level four 🙂 thank you. pic.twitter.com/19IdD0V2Qz

— riccardo (@ricca9380) November 5, 2015

Written

on 2014-03-17