12956561819761 has 16 divisors (see below), whose sum is σ = 15176178823680. Its totient is φ = 10829383326720.

The previous prime is 12956561819737. The next prime is 12956561819791. The reversal of 12956561819761 is 16791816565921.

12956561819761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12956561819761 - 2¹³ = 12956561811569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12956561819701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10612201 + ... + 11769958.

It is an arithmetic number, because the mean of its divisors is an integer number (948511176480).

Almost surely, 2^{12956561819761} is an apocalyptic number.

It is an amenable number.

12956561819761 is a deficient number, since it is larger than the sum of its proper divisors (2219617003919).

12956561819761 is a wasteful number, since it uses less digits than its factorization.

12956561819761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22384224.

The product of its digits is 48988800, while the sum is 67.

The spelling of 12956561819761 in words is "twelve trillion, nine hundred fifty-six billion, five hundred sixty-one million, eight hundred nineteen thousand, seven hundred sixty-one".