664327531 has 8 divisors (see below), whose sum is σ = 762577920. Its totient is φ = 566913768.

The previous prime is 664327529. The next prime is 664327567. The reversal of 664327531 is 135723466.

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 664327531 - 2¹ = 664327529 is a prime.

It is a super-2 number, since 2×664327531² = 882662136889111922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664327231) 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 7 ways as a sum of consecutive naturals, for example, 207451 + ... + 210628.

It is an arithmetic number, because the mean of its divisors is an integer number (95322240).

Almost surely, 2^664327531 is an apocalyptic number.

664327531 is a deficient number, since it is larger than the sum of its proper divisors (98250389).

664327531 is a wasteful number, since it uses less digits than its factorization.

664327531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418313.

The product of its digits is 90720, while the sum is 37.

The square root of 664327531 is about 25774.5520038661. The cubic root of 664327531 is about 872.5575558291.

The spelling of 664327531 in words is "six hundred sixty-four million, three hundred twenty-seven thousand, five hundred thirty-one".