664811 has 8 divisors (see below), whose sum is σ = 770784. Its totient is φ = 561600.

The previous prime is 664799. The next prime is 664843. The reversal of 664811 is 118466.

664811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664811 - 2¹⁰ = 663787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (96348).

2⁶⁶⁴⁸¹¹ is an apocalyptic number.

664811 is a deficient number, since it is larger than the sum of its proper divisors (105973).

664811 is a wasteful number, since it uses less digits than its factorization.

664811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381.

The product of its digits is 1152, while the sum is 26.

The square root of 664811 is about 815.3594299449. The cubic root of 664811 is about 87.2769174453.

The spelling of 664811 in words is "six hundred sixty-four thousand, eight hundred eleven".