664704023 has 2 divisors, whose sum is σ = 664704024. Its totient is φ = 664704022.

The previous prime is 664704017. The next prime is 664704091. The reversal of 664704023 is 320407466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664704023 - 2⁶ = 664703959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664707023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332352011 + 332352012.

It is an arithmetic number, because the mean of its divisors is an integer number (332352012).

Almost surely, 2^664704023 is an apocalyptic number.

664704023 is a deficient number, since it is larger than the sum of its proper divisors (1).

664704023 is an equidigital number, since it uses as much as digits as its factorization.

664704023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 664704023 is about 25781.8545298821. The cubic root of 664704023 is about 872.7223585230.

The spelling of 664704023 in words is "six hundred sixty-four million, seven hundred four thousand, twenty-three".