3 and 5
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39 and 45 are not relatively prime because they have 3 as a common factor. Relatively prime numbers have no common factor greater than 1.
45 and 64 are not prime numbers because they both have more than two factors
The prime numbers between 45 and 60 are 47, 53, and 59. The common factors of 45 and 60 are 1, 3, 5, and 15. The greatest common factor of 45 and 60 is 15.
15 is a factor of 45, but it is not a prime number.
3 is one of the prime numbers of 45.