664444325 has 24 divisors (see below), whose sum is σ = 833696640. Its totient is φ = 525283200.

The previous prime is 664444301. The next prime is 664444327. The reversal of 664444325 is 523444466.

It is not a de Polignac number, because 664444325 - 2¹² = 664440229 is a prime.

It is a super-2 number, since 2×664444325² = 882972522049411250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664444327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1275065 + ... + 1275585.

It is an arithmetic number, because the mean of its divisors is an integer number (34737360).

Almost surely, 2^664444325 is an apocalyptic number.

It is an amenable number.

664444325 is a deficient number, since it is larger than the sum of its proper divisors (169252315).

664444325 is a wasteful number, since it uses less digits than its factorization.

664444325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1032 counting only the distinct ones).

The product of its digits is 276480, while the sum is 38.

The square root of 664444325 is about 25776.8175886784. The cubic root of 664444325 is about 872.6086869910.

The spelling of 664444325 in words is "six hundred sixty-four million, four hundred forty-four thousand, three hundred twenty-five".