256631075651145 has 32 divisors (see below), whose sum is σ = 442199885162112. Its totient is φ = 126340080924672.

The previous prime is 256631075651123. The next prime is 256631075651173. The reversal of 256631075651145 is 541156570136652.

256631075651145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256631075651145 - 2⁷ = 256631075651017 is a prime.

It is a super-2 number, since 2×256631075651145² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10979929 + ... + 25175801.

It is an arithmetic number, because the mean of its divisors is an integer number (13818746411316).

Almost surely, 2^{256631075651145} is an apocalyptic number.

It is an amenable number.

256631075651145 is a deficient number, since it is larger than the sum of its proper divisors (185568809510967).

256631075651145 is a wasteful number, since it uses less digits than its factorization.

256631075651145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14288601.

The product of its (nonzero) digits is 22680000, while the sum is 57.

The spelling of 256631075651145 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, seventy-five million, six hundred fifty-one thousand, one hundred forty-five".