Only one; 2. 128 = 2 x 2 x 2 x 2 x 2 x 2 x 2
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There are no such two prime numbers, as 167 is a prime number itself.
none
When you multiply two prime numbers together they become factors of the number that they equal. Since the number will have factors other than 1 and itself, the number cannot be prime.
No: 105 and 128 are both composite numbers because they have more than two factors
2*17