664853 has 16 divisors (see below), whose sum is σ = 831744. Its totient is φ = 518400.

The previous prime is 664849. The next prime is 664879. The reversal of 664853 is 358466.

It is a cyclic number.

It is not a de Polignac number, because 664853 - 2² = 664849 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4328 + ... + 4478.

It is an arithmetic number, because the mean of its divisors is an integer number (51984).

2⁶⁶⁴⁸⁵³ is an apocalyptic number.

It is an amenable number.

664853 is a deficient number, since it is larger than the sum of its proper divisors (166891).

664853 is a wasteful number, since it uses less digits than its factorization.

664853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its digits is 17280, while the sum is 32.

The square root of 664853 is about 815.3851850506. The cubic root of 664853 is about 87.2787553378.

The spelling of 664853 in words is "six hundred sixty-four thousand, eight hundred fifty-three".