664143652 has 12 divisors (see below), whose sum is σ = 1186980480. Its totient is φ = 325006376.

The previous prime is 664143647. The next prime is 664143719. The reversal of 664143652 is 256341466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766152 + ... + 1766527.

It is an arithmetic number, because the mean of its divisors is an integer number (98915040).

Almost surely, 2^664143652 is an apocalyptic number.

It is an amenable number.

664143652 is a deficient number, since it is larger than the sum of its proper divisors (522836828).

664143652 is a wasteful number, since it uses less digits than its factorization.

664143652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532730 (or 3532728 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 664143652 is about 25770.9846920912. The cubic root of 664143652 is about 872.4770434268.

The spelling of 664143652 in words is "six hundred sixty-four million, one hundred forty-three thousand, six hundred fifty-two".