664660437 has 8 divisors (see below), whose sum is σ = 1012815936. Its totient is φ = 379805952.

The previous prime is 664660433. The next prime is 664660481. The reversal of 664660437 is 734066466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664660437 - 2² = 664660433 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664660433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15825228 + ... + 15825269.

It is an arithmetic number, because the mean of its divisors is an integer number (126601992).

Almost surely, 2^664660437 is an apocalyptic number.

It is an amenable number.

664660437 is a deficient number, since it is larger than the sum of its proper divisors (348155499).

664660437 is a wasteful number, since it uses less digits than its factorization.

664660437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31650507.

The product of its (nonzero) digits is 435456, while the sum is 42.

The square root of 664660437 is about 25781.0092316030. The cubic root of 664660437 is about 872.7032827104.

The spelling of 664660437 in words is "six hundred sixty-four million, six hundred sixty thousand, four hundred thirty-seven".