256161616800767 has 4 divisors (see below), whose sum is σ = 256161688728720. Its totient is φ = 256161544872816.

The previous prime is 256161616800751. The next prime is 256161616800779. The reversal of 256161616800767 is 767008616161652.

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 256161616800767 - 2⁴ = 256161616800751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256161616800367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30327467 + ... + 37842812.

It is an arithmetic number, because the mean of its divisors is an integer number (64040422182180).

Almost surely, 2^{256161616800767} is an apocalyptic number.

256161616800767 is a deficient number, since it is larger than the sum of its proper divisors (71927953).

256161616800767 is an equidigital number, since it uses as much as digits as its factorization.

256161616800767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71927952.

The product of its (nonzero) digits is 30481920, while the sum is 62.

The spelling of 256161616800767 in words is "two hundred fifty-six trillion, one hundred sixty-one billion, six hundred sixteen million, eight hundred thousand, seven hundred sixty-seven".