256253796671 has 4 divisors (see below), whose sum is σ = 256265725344. Its totient is φ = 256241868000.

The previous prime is 256253796649. The next prime is 256253796691. The reversal of 256253796671 is 176697352652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256253796671 - 2⁶ = 256253796607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256253796671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256253796691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5932055 + ... + 5975096.

It is an arithmetic number, because the mean of its divisors is an integer number (64066431336).

Almost surely, 2^256253796671 is an apocalyptic number.

256253796671 is a deficient number, since it is larger than the sum of its proper divisors (11928673).

256253796671 is a wasteful number, since it uses less digits than its factorization.

256253796671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11928672.

The product of its digits is 28576800, while the sum is 59.

The spelling of 256253796671 in words is "two hundred fifty-six billion, two hundred fifty-three million, seven hundred ninety-six thousand, six hundred seventy-one".