256165565043 has 4 divisors (see below), whose sum is σ = 341554086728. Its totient is φ = 170777043360.

The previous prime is 256165565041. The next prime is 256165565053. The reversal of 256165565043 is 340565561652.

256165565043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 256165565043 - 2¹ = 256165565041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256165564983 and 256165565001.

It is not an unprimeable number, because it can be changed into a prime (256165565041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42694260838 + ... + 42694260843.

It is an arithmetic number, because the mean of its divisors is an integer number (85388521682).

Almost surely, 2^256165565043 is an apocalyptic number.

256165565043 is a deficient number, since it is larger than the sum of its proper divisors (85388521685).

256165565043 is an equidigital number, since it uses as much as digits as its factorization.

256165565043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85388521684.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 256165565043 in words is "two hundred fifty-six billion, one hundred sixty-five million, five hundred sixty-five thousand, forty-three".