664623359 has 2 divisors, whose sum is σ = 664623360. Its totient is φ = 664623358.

The previous prime is 664623343. The next prime is 664623361. The reversal of 664623359 is 953326466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664623359 - 2⁴ = 664623343 is a prime.

Together with 664623361, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664623319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332311679 + 332311680.

It is an arithmetic number, because the mean of its divisors is an integer number (332311680).

Almost surely, 2^664623359 is an apocalyptic number.

664623359 is a deficient number, since it is larger than the sum of its proper divisors (1).

664623359 is an equidigital number, since it uses as much as digits as its factorization.

664623359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 44.

The square root of 664623359 is about 25780.2901263737. The cubic root of 664623359 is about 872.6870545272.

The spelling of 664623359 in words is "six hundred sixty-four million, six hundred twenty-three thousand, three hundred fifty-nine".