256129861426 has 8 divisors (see below), whose sum is σ = 384870004380. Its totient is φ = 127839859968.

The previous prime is 256129861391. The next prime is 256129861439. The reversal of 256129861426 is 624168921652.

256129861426 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 253456868025 + 2672993401 = 503445^2 + 51701^2 .

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, 112533951 + ... + 112536226.

Almost surely, 2^256129861426 is an apocalyptic number.

256129861426 is a deficient number, since it is larger than the sum of its proper divisors (128740142954).

256129861426 is a wasteful number, since it uses less digits than its factorization.

256129861426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225070748.

The product of its digits is 2488320, while the sum is 52.

The spelling of 256129861426 in words is "two hundred fifty-six billion, one hundred twenty-nine million, eight hundred sixty-one thousand, four hundred twenty-six".