256895065 has 8 divisors (see below), whose sum is σ = 352313280. Its totient is φ = 176156592.

The previous prime is 256895039. The next prime is 256895069. The reversal of 256895065 is 560598652.

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 256895065 - 2¹⁵ = 256862297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256895069) 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, 3669895 + ... + 3669964.

It is an arithmetic number, because the mean of its divisors is an integer number (44039160).

Almost surely, 2^256895065 is an apocalyptic number.

It is an amenable number.

256895065 is a deficient number, since it is larger than the sum of its proper divisors (95418215).

256895065 is an equidigital number, since it uses as much as digits as its factorization.

256895065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7339871.

The product of its (nonzero) digits is 648000, while the sum is 46.

The square root of 256895065 is about 16027.9463750039. The cubic root of 256895065 is about 635.6995741361.

The spelling of 256895065 in words is "two hundred fifty-six million, eight hundred ninety-five thousand, sixty-five".