2 x 2 x 2 x 2 x 2 x 2 = 64
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Prime numbers only have two factors, one and the number itself.
A Russian doll prime number is a prime number such that successively removing the right-most digit leaves a prime number.For example, 373 is a prime.Remove the last digit: 37 is a prime.Remove the last digit: 3 is a prime.There aer 83 such numbers in base-10 and the largest of these is 73,939,133.
There is no prime number from one to a hundred that has more factors than any other prime number. By definition, a prime number has exactly two factors, 1 and itself. The number 1 has only one factor - itself. All prime numbers have exactly the same number of factors - two. Composite numbers have more than two factors.
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.
Oh, dude, you're really making me work here. Okay, so the largest five-digit number with no prime digits would be 98760. I mean, it's not the most exciting number, but hey, rules are rules, right?