664659131 has 4 divisors (see below), whose sum is σ = 675924600. Its totient is φ = 653393664.

The previous prime is 664659067. The next prime is 664659133. The reversal of 664659131 is 131956466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664659131 - 2⁶ = 664659067 is a prime.

It is a super-2 number, since 2×664659131² = 883543520843350322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664659133) 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 3 ways as a sum of consecutive naturals, for example, 5632646 + ... + 5632763.

It is an arithmetic number, because the mean of its divisors is an integer number (168981150).

Almost surely, 2^664659131 is an apocalyptic number.

664659131 is a deficient number, since it is larger than the sum of its proper divisors (11265469).

664659131 is a wasteful number, since it uses less digits than its factorization.

664659131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11265468.

The product of its digits is 116640, while the sum is 41.

The square root of 664659131 is about 25780.9839028692. The cubic root of 664659131 is about 872.7027111146.

The spelling of 664659131 in words is "six hundred sixty-four million, six hundred fifty-nine thousand, one hundred thirty-one".