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Q: How many digits is the largest prime number?

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17,425,170 digits

There is no such thing as a largest prime number as there are infinitely many, but the largest known prime is a Mersenne Prime (one less than a power of two) - 257,885,161- 1.

Many prime numbers and many composite numbers.

Prime numbers are pure numbers, without units or dimensions.

There are 9 digits in a Social Security Number.

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17,425,170 digits

As of August 2017, the largest known prime number is 2^74,207,281 − 1, a number with 22,338,618digits.

It has been proven that there is no largest prime number, and therefore there exists a prime number, in fact, infinitely many, greater than 10^999999999 (having a billion digits); however, no humans have actually found a specific number of that size and identified it as prime.

The new prime number, 2 multiplied by itself 57,885,161times, less one, has 17,425,170 digits.

The answer is 1. The smallest prime is 2 and the greatest prime (of however many digits) must be odd. The remainder of ANY odd number when divided by 2 must be 1.

The largest known prime number is 243112609 - 1, the largest integer that is currently known to be a prime number. It was proven by Euclid that there are infinitely many prime numbers; thus, there is always a prime greater than the largest known prime.

There is no such thing as a largest prime number as there are infinitely many, but the largest known prime is a Mersenne Prime (one less than a power of two) - 257,885,161- 1.

There are four pair of mirror primes.

it is a whole number, it has two digits, it is not a prime number, it is positive, 4 months have this many days

Over/about 13 million digits! wow that's a long number! if you wanna see it, go to www.math.Utah.edu/~pa/math/largeprime.HTML

Yes. There are infinitely many prime numbers so that the largest prime number is infiitely large. The current understanding of the universe suggests that it is finite, and therefore the number of atoms must be smaller.

Many prime numbers and many composite numbers.

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