12982881565 has 4 divisors (see below), whose sum is σ = 15579457884. Its totient is φ = 10386305248.

The previous prime is 12982881563. The next prime is 12982881607. The reversal of 12982881565 is 56518828921.

12982881565 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, and also an emirpimes, since its reverse is a distinct semiprime: 56518828921 = 8053 ⋅7018357.

It can be written as a sum of positive squares in 2 ways, for example, as 6749936964 + 6232944601 = 82158^2 + 78949^2 .

It is a cyclic number.

It is not a de Polignac number, because 12982881565 - 2¹ = 12982881563 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 (12982881563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1298288152 + ... + 1298288161.

It is an arithmetic number, because the mean of its divisors is an integer number (3894864471).

Almost surely, 2^12982881565 is an apocalyptic number.

It is an amenable number.

12982881565 is a deficient number, since it is larger than the sum of its proper divisors (2596576319).

12982881565 is an equidigital number, since it uses as much as digits as its factorization.

12982881565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596576318.

The product of its digits is 2764800, while the sum is 55.

The spelling of 12982881565 in words is "twelve billion, nine hundred eighty-two million, eight hundred eighty-one thousand, five hundred sixty-five".