667853664 has 24 divisors (see below), whose sum is σ = 1753116120. Its totient is φ = 222617856.

The previous prime is 667853651. The next prime is 667853699. The reversal of 667853664 is 466358766.

667853664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478309 + ... + 3478500.

It is an arithmetic number, because the mean of its divisors is an integer number (73046505).

Almost surely, 2^667853664 is an apocalyptic number.

It is an amenable number.

667853664 is an abundant number, since it is smaller than the sum of its proper divisors (1085262456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667853664 is a wasteful number, since it uses less digits than its factorization.

667853664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6956822 (or 6956814 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The square root of 667853664 is about 25842.8648566679. The cubic root of 667853664 is about 874.0986261708.

The spelling of 667853664 in words is "six hundred sixty-seven million, eight hundred fifty-three thousand, six hundred sixty-four".