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Highest prime factor, indeed only prime factor, is 5
Seven is the highest prime factor. The prime factors for 210 are: 2 x 3 x 5 x 7
The prime factors of 125 are 5x5x5. The highest proper factor is 25.
Two numbers are relatively prime if they have no common factor other than 1. Equivalently, if their highest common factor is 1.
Highest common factor is 18