256891605359 has 16 divisors (see below), whose sum is σ = 270712877760. Its totient is φ = 243300583680.

The previous prime is 256891605337. The next prime is 256891605379. The reversal of 256891605359 is 953506198652.

It is a cyclic number.

It is not a de Polignac number, because 256891605359 - 2¹⁶ = 256891539823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256891605298 and 256891605307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256891605379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1120949 + ... + 1330529.

It is an arithmetic number, because the mean of its divisors is an integer number (16919554860).

Almost surely, 2^256891605359 is an apocalyptic number.

256891605359 is a deficient number, since it is larger than the sum of its proper divisors (13821272401).

256891605359 is a wasteful number, since it uses less digits than its factorization.

256891605359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210130.

The product of its (nonzero) digits is 17496000, while the sum is 59.

The spelling of 256891605359 in words is "two hundred fifty-six billion, eight hundred ninety-one million, six hundred five thousand, three hundred fifty-nine".