256535456432457 has 16 divisors (see below), whose sum is σ = 343983999723840. Its totient is φ = 170055418970112.

The previous prime is 256535456432429. The next prime is 256535456432473. The reversal of 256535456432457 is 754234654535652.

It is a happy number.

It is not a de Polignac number, because 256535456432457 - 2¹⁹ = 256535455908169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256535456432407) 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, 10792768 + ... + 25090929.

It is an arithmetic number, because the mean of its divisors is an integer number (21498999982740).

Almost surely, 2^{256535456432457} is an apocalyptic number.

It is an amenable number.

256535456432457 is a deficient number, since it is larger than the sum of its proper divisors (87448543291383).

256535456432457 is a wasteful number, since it uses less digits than its factorization.

256535456432457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35897192.

The product of its digits is 1814400000, while the sum is 66.

The spelling of 256535456432457 in words is "two hundred fifty-six trillion, five hundred thirty-five billion, four hundred fifty-six million, four hundred thirty-two thousand, four hundred fifty-seven".