664911 has 12 divisors (see below), whose sum is σ = 1034488. Its totient is φ = 409104.

The previous prime is 664891. The next prime is 664933. The reversal of 664911 is 119466.

664911 is a `hidden beast` number, since 6 + 649 + 11 = 666.

664911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664911 - 2⁵ = 664879 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2725 + ... + 2958.

2⁶⁶⁴⁹¹¹ is an apocalyptic number.

664911 is a deficient number, since it is larger than the sum of its proper divisors (369577).

664911 is a wasteful number, since it uses less digits than its factorization.

664911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702 (or 5699 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 664911 is about 815.4207502878. The cubic root of 664911 is about 87.2812932525.

The spelling of 664911 in words is "six hundred sixty-four thousand, nine hundred eleven".