664321325 has 12 divisors (see below), whose sum is σ = 872215380. Its totient is φ = 500194560.

The previous prime is 664321321. The next prime is 664321327. The reversal of 664321325 is 523123466.

It can be written as a sum of positive squares in 6 ways, for example, as 68326756 + 595994569 = 8266^2 + 24413^2 .

It is not a de Polignac number, because 664321325 - 2² = 664321321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664321291 and 664321300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664321321) 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 11 ways as a sum of consecutive naturals, for example, 781130 + ... + 781979.

It is an arithmetic number, because the mean of its divisors is an integer number (72684615).

Almost surely, 2^664321325 is an apocalyptic number.

It is an amenable number.

664321325 is a deficient number, since it is larger than the sum of its proper divisors (207894055).

664321325 is a wasteful number, since it uses less digits than its factorization.

664321325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563136 (or 1563131 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 664321325 is about 25774.4316135196. The cubic root of 664321325 is about 872.5548387411.

The spelling of 664321325 in words is "six hundred sixty-four million, three hundred twenty-one thousand, three hundred twenty-five".