12943257961 has 4 divisors (see below), whose sum is σ = 13099200912. Its totient is φ = 12787315012.

The previous prime is 12943257941. The next prime is 12943257973. The reversal of 12943257961 is 16975234921.

12943257961 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12943257961 - 2²⁵ = 12909703529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12943257911) 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, 77971351 + ... + 77971516.

It is an arithmetic number, because the mean of its divisors is an integer number (3274800228).

Almost surely, 2^12943257961 is an apocalyptic number.

It is an amenable number.

12943257961 is a deficient number, since it is larger than the sum of its proper divisors (155942951).

12943257961 is an equidigital number, since it uses as much as digits as its factorization.

12943257961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155942950.

The product of its digits is 816480, while the sum is 49.

The spelling of 12943257961 in words is "twelve billion, nine hundred forty-three million, two hundred fifty-seven thousand, nine hundred sixty-one".