256665326 has 16 divisors (see below), whose sum is σ = 409320864. Its totient is φ = 120435744.

The previous prime is 256665317. The next prime is 256665329. The reversal of 256665326 is 623566652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256665329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50201 + ... + 55076.

It is an arithmetic number, because the mean of its divisors is an integer number (25582554).

Almost surely, 2^256665326 is an apocalyptic number.

256665326 is a deficient number, since it is larger than the sum of its proper divisors (152655538).

256665326 is a wasteful number, since it uses less digits than its factorization.

256665326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105355.

The product of its digits is 388800, while the sum is 41.

The square root of 256665326 is about 16020.7779461548. Note that the first 3 decimals coincide. The cubic root of 256665326 is about 635.5100174369.

The spelling of 256665326 in words is "two hundred fifty-six million, six hundred sixty-five thousand, three hundred twenty-six".