256788563 has 2 divisors, whose sum is σ = 256788564. Its totient is φ = 256788562.

The previous prime is 256788541. The next prime is 256788577. The reversal of 256788563 is 365887652.

256788563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256788563 - 2¹² = 256784467 is a prime.

It is not a weakly prime, because it can be changed into another prime (256718563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128394281 + 128394282.

It is an arithmetic number, because the mean of its divisors is an integer number (128394282).

Almost surely, 2^256788563 is an apocalyptic number.

256788563 is a deficient number, since it is larger than the sum of its proper divisors (1).

256788563 is an equidigital number, since it uses as much as digits as its factorization.

256788563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 50.

The square root of 256788563 is about 16024.6236461266. The cubic root of 256788563 is about 635.6117138338.

The spelling of 256788563 in words is "two hundred fifty-six million, seven hundred eighty-eight thousand, five hundred sixty-three".