256741115689 has 4 divisors (see below), whose sum is σ = 260949986500. Its totient is φ = 252532244880.

The previous prime is 256741115677. The next prime is 256741115699. The reversal of 256741115689 is 986511147652.

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 99225000000 + 157516115689 = 315000^2 + 396883^2 .

It is a cyclic number.

It is not a de Polignac number, because 256741115689 - 2¹⁵ = 256741082921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256741115699) 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, 2104435314 + ... + 2104435435.

It is an arithmetic number, because the mean of its divisors is an integer number (65237496625).

Almost surely, 2^256741115689 is an apocalyptic number.

It is an amenable number.

256741115689 is a deficient number, since it is larger than the sum of its proper divisors (4208870811).

256741115689 is an equidigital number, since it uses as much as digits as its factorization.

256741115689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208870810.

The product of its digits is 3628800, while the sum is 55.

The spelling of 256741115689 in words is "two hundred fifty-six billion, seven hundred forty-one million, one hundred fifteen thousand, six hundred eighty-nine".