256723846091 has 4 divisors (see below), whose sum is σ = 257285605512. Its totient is φ = 256162086672.

The previous prime is 256723846069. The next prime is 256723846097. The reversal of 256723846091 is 190648327652.

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 256723846091 - 2¹⁴ = 256723829707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256723846097) 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, 280879025 + ... + 280879938.

It is an arithmetic number, because the mean of its divisors is an integer number (64321401378).

It is a 1-persistent number, because it is pandigital, but 2⋅256723846091 = 513447692182 is not.

Almost surely, 2^256723846091 is an apocalyptic number.

256723846091 is a deficient number, since it is larger than the sum of its proper divisors (561759421).

256723846091 is an equidigital number, since it uses as much as digits as its factorization.

256723846091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561759420.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 256723846091 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred forty-six thousand, ninety-one".