There are 21 two-digit prime numbers.
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73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
there are 4
There are 5 of them.
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
There are only two prime numbers that are consecutive numbers, 2 and 3. Their product is 2 x 3 = 6. The first prime numbers are 2, 3, 5, and 7 and the only two consecutive prime numbers whose product is a single digit are 2 and 3. (The next two consecutive prime numbers, 3 and 5, have a two-digit product.)