664743512 has 16 divisors (see below), whose sum is σ = 1248504840. Its totient is φ = 331808896.

The previous prime is 664743487. The next prime is 664743551. The reversal of 664743512 is 215347466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 65318 + ... + 74805.

Almost surely, 2^664743512 is an apocalyptic number.

It is an amenable number.

664743512 is a deficient number, since it is larger than the sum of its proper divisors (583761328).

664743512 is a wasteful number, since it uses less digits than its factorization.

664743512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140722 (or 140718 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The square root of 664743512 is about 25782.6203478235. The cubic root of 664743512 is about 872.7396405260.

The spelling of 664743512 in words is "six hundred sixty-four million, seven hundred forty-three thousand, five hundred twelve".