12956561819759 has 4 divisors (see below), whose sum is σ = 13374515426880. Its totient is φ = 12538608212640.

The previous prime is 12956561819737. The next prime is 12956561819791. The reversal of 12956561819759 is 95791816565921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12956561819759 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 (12956561819659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208976803514 + ... + 208976803575.

It is an arithmetic number, because the mean of its divisors is an integer number (3343628856720).

Almost surely, 2^{12956561819759} is an apocalyptic number.

12956561819759 is a deficient number, since it is larger than the sum of its proper divisors (417953607121).

12956561819759 is an equidigital number, since it uses as much as digits as its factorization.

12956561819759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417953607120.

The product of its digits is 367416000, while the sum is 74.

The spelling of 12956561819759 in words is "twelve trillion, nine hundred fifty-six billion, five hundred sixty-one million, eight hundred nineteen thousand, seven hundred fifty-nine".