256326565 has 16 divisors (see below), whose sum is σ = 344626560. Its totient is φ = 181379520.

The previous prime is 256326541. The next prime is 256326583. The reversal of 256326565 is 565623652.

It is not a de Polignac number, because 256326565 - 2⁷ = 256326437 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 60945 + ... + 65014.

It is an arithmetic number, because the mean of its divisors is an integer number (21539160).

Almost surely, 2^256326565 is an apocalyptic number.

It is an amenable number.

256326565 is a deficient number, since it is larger than the sum of its proper divisors (88299995).

256326565 is a wasteful number, since it uses less digits than its factorization.

256326565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126012.

The product of its digits is 324000, while the sum is 40.

The square root of 256326565 is about 16010.2019037862. The cubic root of 256326565 is about 635.2303006590.

The spelling of 256326565 in words is "two hundred fifty-six million, three hundred twenty-six thousand, five hundred sixty-five".