256621151365 has 16 divisors (see below), whose sum is σ = 326119661568. Its totient is φ = 193185167616.

The previous prime is 256621151333. The next prime is 256621151377. The reversal of 256621151365 is 563151126652.

It is a happy number.

256621151365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 256621151365 - 2⁵ = 256621151333 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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193444 + ... + 742066.

It is an arithmetic number, because the mean of its divisors is an integer number (20382478848).

Almost surely, 2^256621151365 is an apocalyptic number.

It is an amenable number.

256621151365 is a deficient number, since it is larger than the sum of its proper divisors (69498510203).

256621151365 is a wasteful number, since it uses less digits than its factorization.

256621151365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554148.

The product of its digits is 324000, while the sum is 43.

The spelling of 256621151365 in words is "two hundred fifty-six billion, six hundred twenty-one million, one hundred fifty-one thousand, three hundred sixty-five".