664685285 has 16 divisors (see below), whose sum is σ = 871879680. Its totient is φ = 482437440.

The previous prime is 664685267. The next prime is 664685293. The reversal of 664685285 is 582586466.

It is not a de Polignac number, because 664685285 - 2⁸ = 664685029 is a prime.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 16124 + ... + 39866.

It is an arithmetic number, because the mean of its divisors is an integer number (54492480).

Almost surely, 2^664685285 is an apocalyptic number.

It is an amenable number.

664685285 is a deficient number, since it is larger than the sum of its proper divisors (207194395).

664685285 is a wasteful number, since it uses less digits than its factorization.

664685285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24268.

The product of its digits is 2764800, while the sum is 50.

The square root of 664685285 is about 25781.4911322057. The cubic root of 664685285 is about 872.7141577677.

The spelling of 664685285 in words is "six hundred sixty-four million, six hundred eighty-five thousand, two hundred eighty-five".