256559779 has 8 divisors (see below), whose sum is σ = 305959680. Its totient is φ = 210347016.

The previous prime is 256559777. The next prime is 256559783. The reversal of 256559779 is 977955652.

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 256559779 - 2¹ = 256559777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256559773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796609 + ... + 796930.

It is an arithmetic number, because the mean of its divisors is an integer number (38244960).

Almost surely, 2^256559779 is an apocalyptic number.

256559779 is a deficient number, since it is larger than the sum of its proper divisors (49399901).

256559779 is a wasteful number, since it uses less digits than its factorization.

256559779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593569.

The product of its digits is 5953500, while the sum is 55.

The square root of 256559779 is about 16017.4835414306. The cubic root of 256559779 is about 635.4228931216.

The spelling of 256559779 in words is "two hundred fifty-six million, five hundred fifty-nine thousand, seven hundred seventy-nine".