256560663178 has 8 divisors (see below), whose sum is σ = 384843167172. Its totient is φ = 128279607456.

The previous prime is 256560663167. The next prime is 256560663197. The reversal of 256560663178 is 871366065652.

256560663178 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 256397411449 + 163251729 = 506357^2 + 12777^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 410526 + ... + 825622.

Almost surely, 2^256560663178 is an apocalyptic number.

256560663178 is a deficient number, since it is larger than the sum of its proper divisors (128282503994).

256560663178 is a wasteful number, since it uses less digits than its factorization.

256560663178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724136.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 256560663178 in words is "two hundred fifty-six billion, five hundred sixty million, six hundred sixty-three thousand, one hundred seventy-eight".