Q: What two prime numbers equal a 400 digit number?

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There are 17 such numbers.

73 is the largest two-digit number that is prime and has prime numbers for both of its digits.

679 is the product of the largest single-digit prime number and the largest two-digit prime number.

73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.

997 is the largest 3-digit prime number.

Related questions

There are 17 such numbers.

The greatest two-digit prime number is 97. The lowest two-digit prime number is 11. The product of the two numbers is equal to 1067.

For the tens digit to be a prime number then it must equal 2, 3, 5 or 7. There are four 3-digit prime numbers that fit the above condition and also have the tens and units digits forming a 2-digit prime number. 131, 137, 173, 179. The person supplying the question may like to sum the various combinations.

73 is the largest two-digit number that is prime and has prime numbers for both of its digits.

679 is the product of the largest single-digit prime number and the largest two-digit prime number.

73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.

The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.

997 is the largest 3-digit prime number.

Greatest 2 digit Prime number is 97. Lease 2 digit prime number is 11.

Greatest 2 digit prime number is 97. Lease 2 digit prime number is 11.

There are four of each.

It is 997.