Powers of 2: 2, 4, 8, 16, 32, 64 and so on.
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The only prime factor of 128 is 2.
The only prime factor these numbers share is 2. It is the only prime factor of 64, which is 2 to the 6th power. The hcf is 16, but that is not a prime.
The only prime factor of 64 is 2.
There is only one even prime number: 2. All other even numbers have 2 as a factor, in addition to 1 and themselves, so they cannot be prime numbers.
There is only one even prime number, and that is 2. The reason is that all even numbers greater than 2 have 2 as a factor.