256426121365 has 16 divisors (see below), whose sum is σ = 313537392000. Its totient is φ = 201257364672.

The previous prime is 256426121339. The next prime is 256426121431. The reversal of 256426121365 is 563121624652.

It is a cyclic number.

It is not a de Polignac number, because 256426121365 - 2²⁵ = 256392566933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7922986 + ... + 7955284.

It is an arithmetic number, because the mean of its divisors is an integer number (19596087000).

Almost surely, 2^256426121365 is an apocalyptic number.

It is an amenable number.

256426121365 is a deficient number, since it is larger than the sum of its proper divisors (57111270635).

256426121365 is a wasteful number, since it uses less digits than its factorization.

256426121365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62316.

The product of its digits is 518400, while the sum is 43.

The spelling of 256426121365 in words is "two hundred fifty-six billion, four hundred twenty-six million, one hundred twenty-one thousand, three hundred sixty-five".