256913261185 has 16 divisors (see below), whose sum is σ = 352514716416. Its totient is φ = 176080828608.

The previous prime is 256913261183. The next prime is 256913261197. The reversal of 256913261185 is 581162319652.

It is a cyclic number.

It is not a de Polignac number, because 256913261185 - 2¹ = 256913261183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256913261183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1767957 + ... + 1907746.

It is an arithmetic number, because the mean of its divisors is an integer number (22032169776).

Almost surely, 2^256913261185 is an apocalyptic number.

It is an amenable number.

256913261185 is a deficient number, since it is larger than the sum of its proper divisors (95601455231).

256913261185 is a wasteful number, since it uses less digits than its factorization.

256913261185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677712.

The product of its digits is 777600, while the sum is 49.

The spelling of 256913261185 in words is "two hundred fifty-six billion, nine hundred thirteen million, two hundred sixty-one thousand, one hundred eighty-five".