256026563 has 4 divisors (see below), whose sum is σ = 275720928. Its totient is φ = 236332200.

The previous prime is 256026557. The next prime is 256026571. The reversal of 256026563 is 365620652.

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

It is not a de Polignac number, because 256026563 - 2¹⁴ = 256010179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256026583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9847163 + ... + 9847188.

It is an arithmetic number, because the mean of its divisors is an integer number (68930232).

Almost surely, 2^256026563 is an apocalyptic number.

256026563 is a deficient number, since it is larger than the sum of its proper divisors (19694365).

256026563 is a wasteful number, since it uses less digits than its factorization.

256026563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19694364.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 256026563 is about 16000.8300722181. The cubic root of 256026563 is about 634.9823815559.

The spelling of 256026563 in words is "two hundred fifty-six million, twenty-six thousand, five hundred sixty-three".