No. each number has more factors than just 1 and 64 or 1 and 80
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45 and 64 are not prime numbers because they both have more than two factors
64/80 = 8/10 = 80/100 = 80% 64 is 80% of 80.
No, they are not relatively prime.
It can be. 26 is relatively prime to 27. 26 is not relatively prime to 34.
25 is relatively prime with 36. 25 is not relatively prime with 35.