All multiples of 65, which is an infinite number.
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65 is divisible by 1, 5, 13, 65.
All numbers are divisible by 2145. Any element of the set of numbers of the form 2145*k where k is an integer is evenly divisible.
Eight: 45, 50, 55, 60, 65, 70, 75 and 80.
No, 65 and 70 are not relatively prime. Relatively prime numbers only have the number 1 as a common factor. 65 and 70 also have 5 as a common factor, so they are not relatively prime.
Any multiples of 5 are exactly divisible by 5, i.e. any number 5 or larger that ends in 5 or 0 (zero). For example 2789645, 65, 8594620 and 950 are all divisible exactly by 5 as they are all multiples of 5, ending in either 5 or 0 (zero).