256628778037158 has 32 divisors (see below), whose sum is σ = 560979795640320. Its totient is φ = 77913860503680.

The previous prime is 256628778037153. The next prime is 256628778037183. The reversal of 256628778037158 is 851730877826652.

It is a self number, because there is not a number n which added to its sum of digits gives 256628778037158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256628778037153) 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, 40580132518 + ... + 40580138841.

It is an arithmetic number, because the mean of its divisors is an integer number (17530618613760).

Almost surely, 2^{256628778037158} is an apocalyptic number.

256628778037158 is an abundant number, since it is smaller than the sum of its proper divisors (304351017603162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256628778037158 is a wasteful number, since it uses less digits than its factorization.

256628778037158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81160271412.

The product of its (nonzero) digits is 1896652800, while the sum is 75.

The spelling of 256628778037158 in words is "two hundred fifty-six trillion, six hundred twenty-eight billion, seven hundred seventy-eight million, thirty-seven thousand, one hundred fifty-eight".