664986347 has 2 divisors, whose sum is σ = 664986348. Its totient is φ = 664986346.

The previous prime is 664986319. The next prime is 664986349. The reversal of 664986347 is 743689466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664986347 - 2¹⁰ = 664985323 is a prime.

Together with 664986349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664986349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332493173 + 332493174.

It is an arithmetic number, because the mean of its divisors is an integer number (332493174).

Almost surely, 2^664986347 is an apocalyptic number.

664986347 is a deficient number, since it is larger than the sum of its proper divisors (1).

664986347 is an equidigital number, since it uses as much as digits as its factorization.

664986347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 53.

The square root of 664986347 is about 25787.3291947809. The cubic root of 664986347 is about 872.8459000208.

The spelling of 664986347 in words is "six hundred sixty-four million, nine hundred eighty-six thousand, three hundred forty-seven".