256458890689 has 4 divisors (see below), whose sum is σ = 256578677460. Its totient is φ = 256339103920.

The previous prime is 256458890687. The next prime is 256458890713. The reversal of 256458890689 is 986098854652.

It is a happy number.

256458890689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 243945112464 + 12513778225 = 493908^2 + 111865^2 .

It is a cyclic number.

It is not a de Polignac number, because 256458890689 - 2¹ = 256458890687 is a prime.

It is a super-2 number, since 2×256458890689² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256458890687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59890174 + ... + 59894455.

It is an arithmetic number, because the mean of its divisors is an integer number (64144669365).

Almost surely, 2^256458890689 is an apocalyptic number.

It is an amenable number.

256458890689 is a deficient number, since it is larger than the sum of its proper divisors (119786771).

256458890689 is a wasteful number, since it uses less digits than its factorization.

256458890689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119786770.

The product of its (nonzero) digits is 298598400, while the sum is 70.

The spelling of 256458890689 in words is "two hundred fifty-six billion, four hundred fifty-eight million, eight hundred ninety thousand, six hundred eighty-nine".