256778239179 has 16 divisors (see below), whose sum is σ = 426852138240. Its totient is φ = 133391292960.

The previous prime is 256778239171. The next prime is 256778239231. The reversal of 256778239179 is 971932877652.

It is not a de Polignac number, because 256778239179 - 2³ = 256778239171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256778239171) 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, 555796824 + ... + 555797285.

It is an arithmetic number, because the mean of its divisors is an integer number (26678258640).

Almost surely, 2^256778239179 is an apocalyptic number.

256778239179 is a deficient number, since it is larger than the sum of its proper divisors (170073899061).

256778239179 is a wasteful number, since it uses less digits than its factorization.

256778239179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111594130.

The product of its digits is 80015040, while the sum is 66.

The spelling of 256778239179 in words is "two hundred fifty-six billion, seven hundred seventy-eight million, two hundred thirty-nine thousand, one hundred seventy-nine".