256741115691 has 16 divisors (see below), whose sum is σ = 342841123584. Its totient is φ = 170901036384.

The previous prime is 256741115677. The next prime is 256741115699. The reversal of 256741115691 is 196511147652.

It is not a de Polignac number, because 256741115691 - 2¹³ = 256741107499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256741115691.

It is not an unprimeable number, because it can be changed into a prime (256741115699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11716141 + ... + 11738033.

It is an arithmetic number, because the mean of its divisors is an integer number (21427570224).

Almost surely, 2^256741115691 is an apocalyptic number.

256741115691 is a deficient number, since it is larger than the sum of its proper divisors (86100007893).

256741115691 is a wasteful number, since it uses less digits than its factorization.

256741115691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27650.

The product of its digits is 453600, while the sum is 48.

The spelling of 256741115691 in words is "two hundred fifty-six billion, seven hundred forty-one million, one hundred fifteen thousand, six hundred ninety-one".