664325591 has 8 divisors (see below), whose sum is σ = 687593280. Its totient is φ = 641081952.

The previous prime is 664325587. The next prime is 664325593. The reversal of 664325591 is 195523466.

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

It is a cyclic number.

It is not a de Polignac number, because 664325591 - 2² = 664325587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664325593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64301 + ... + 73913.

It is an arithmetic number, because the mean of its divisors is an integer number (85949160).

Almost surely, 2^664325591 is an apocalyptic number.

664325591 is a deficient number, since it is larger than the sum of its proper divisors (23267689).

664325591 is a wasteful number, since it uses less digits than its factorization.

664325591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12025.

The product of its digits is 194400, while the sum is 41.

The square root of 664325591 is about 25774.5143698189. The cubic root of 664325591 is about 872.5567064673.

The spelling of 664325591 in words is "six hundred sixty-four million, three hundred twenty-five thousand, five hundred ninety-one".