664726311 has 32 divisors (see below), whose sum is σ = 1012684800. Its totient is φ = 430725600.

The previous prime is 664726297. The next prime is 664726331. The reversal of 664726311 is 113627466.

It is a happy number.

664726311 is a `hidden beast` number, since 6 + 647 + 2 + 6 + 3 + 1 + 1 = 666.

It is not a de Polignac number, because 664726311 - 2⁹ = 664725799 is a prime.

It is a super-2 number, since 2×664726311² = 883722137071337442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664726331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189885 + ... + 193353.

It is an arithmetic number, because the mean of its divisors is an integer number (31646400).

Almost surely, 2^664726311 is an apocalyptic number.

664726311 is a deficient number, since it is larger than the sum of its proper divisors (347958489).

664726311 is a wasteful number, since it uses less digits than its factorization.

664726311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676 (or 3670 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 664726311 is about 25782.2867682446. The cubic root of 664726311 is about 872.7321127484.

The spelling of 664726311 in words is "six hundred sixty-four million, seven hundred twenty-six thousand, three hundred eleven".