As a product of its prime factors: 3*3*5 = 45
Or as: 23+19+3 = 45
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3 is one of the prime numbers of 45.
The factors of 45 are 1, 3, 5, 9, 15, 45 Of those, 3 and 5 are prime numbers. The prime factors of 45 are 3 and 5.
3 and 5
There are five prime numbers between 45 and 70: 47 53 59 61 67.
3 and 5