256126565 has 8 divisors (see below), whose sum is σ = 310172280. Its totient is φ = 203020992.

The previous prime is 256126561. The next prime is 256126571. The reversal of 256126565 is 565621652.

It is a happy number.

256126565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10452289 + 245674276 = 3233^2 + 15674^2 .

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 256126565 - 2² = 256126561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256126561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234434 + ... + 235523.

It is an arithmetic number, because the mean of its divisors is an integer number (38771535).

Almost surely, 2^256126565 is an apocalyptic number.

It is an amenable number.

256126565 is a deficient number, since it is larger than the sum of its proper divisors (54045715).

256126565 is a wasteful number, since it uses less digits than its factorization.

256126565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470071.

The product of its digits is 108000, while the sum is 38.

The square root of 256126565 is about 16003.9546675189. The cubic root of 256126565 is about 635.0650438673.

The spelling of 256126565 in words is "two hundred fifty-six million, one hundred twenty-six thousand, five hundred sixty-five".