664402723 has 4 divisors (see below), whose sum is σ = 664907760. Its totient is φ = 663897688.

The previous prime is 664402699. The next prime is 664402727. The reversal of 664402723 is 327204466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664402723 - 2⁵ = 664402691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664402727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250540 + ... + 253177.

It is an arithmetic number, because the mean of its divisors is an integer number (166226940).

Almost surely, 2^664402723 is an apocalyptic number.

664402723 is a deficient number, since it is larger than the sum of its proper divisors (505037).

664402723 is a wasteful number, since it uses less digits than its factorization.

664402723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505036.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 664402723 is about 25776.0106106434. The cubic root of 664402723 is about 872.5904747682.

The spelling of 664402723 in words is "six hundred sixty-four million, four hundred two thousand, seven hundred twenty-three".