If you mean the primes: 2 5 7 and 11 then the number is 770
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70
It is 7 because as the product of its prime factors they are: 7*151*223 = 235,711
If a number has 5 factors then it most certainly is not prime. Hence there is some confusion as to what you are asking here.
16 if the prime factors don't have to be distinct. 210 if they do.
Prime numbers, raised to a power, have one more factor than their exponents. The smallest prime number is 2. 210 has eleven factors. 210 = 1024