256789755905 has 8 divisors (see below), whose sum is σ = 309035742912. Its totient is φ = 204839780848.

The previous prime is 256789755899. The next prime is 256789755907. The reversal of 256789755905 is 509557987652.

It is a happy number.

256789755905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256789755905 - 2¹⁸ = 256789493761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256789755907) 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 7 ways as a sum of consecutive naturals, for example, 74001077 + ... + 74004546.

It is an arithmetic number, because the mean of its divisors is an integer number (38629467864).

Almost surely, 2^256789755905 is an apocalyptic number.

It is an amenable number.

256789755905 is a deficient number, since it is larger than the sum of its proper divisors (52245987007).

256789755905 is a wasteful number, since it uses less digits than its factorization.

256789755905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148005975.

The product of its (nonzero) digits is 238140000, while the sum is 68.

The spelling of 256789755905 in words is "two hundred fifty-six billion, seven hundred eighty-nine million, seven hundred fifty-five thousand, nine hundred five".