664667512 has 32 divisors (see below), whose sum is σ = 1278478080. Its totient is φ = 323779680.

The previous prime is 664667473. The next prime is 664667533. The reversal of 664667512 is 215766466.

It is a happy number.

664667512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146023 + ... + 150505.

It is an arithmetic number, because the mean of its divisors is an integer number (39952440).

Almost surely, 2^664667512 is an apocalyptic number.

It is an amenable number.

664667512 is a deficient number, since it is larger than the sum of its proper divisors (613810568).

664667512 is a wasteful number, since it uses less digits than its factorization.

664667512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4963 (or 4959 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 664667512 is about 25781.1464446405. The cubic root of 664667512 is about 872.7063792057.

The spelling of 664667512 in words is "six hundred sixty-four million, six hundred sixty-seven thousand, five hundred twelve".