12956561819737 has 2 divisors, whose sum is σ = 12956561819738. Its totient is φ = 12956561819736.

The previous prime is 12956561819711. The next prime is 12956561819791. The reversal of 12956561819737 is 73791816565921.

12956561819737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9299456349001 + 3657105470736 = 3049501^2 + 1912356^2 .

It is a cyclic number.

It is not a de Polignac number, because 12956561819737 - 2³¹ = 12954414336089 is a prime.

It is not a weakly prime, because it can be changed into another prime (12956561810737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6478280909868 + 6478280909869.

It is an arithmetic number, because the mean of its divisors is an integer number (6478280909869).

Almost surely, 2^{12956561819737} is an apocalyptic number.

It is an amenable number.

12956561819737 is a deficient number, since it is larger than the sum of its proper divisors (1).

12956561819737 is an equidigital number, since it uses as much as digits as its factorization.

12956561819737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 171460800, while the sum is 70.

The spelling of 12956561819737 in words is "twelve trillion, nine hundred fifty-six billion, five hundred sixty-one million, eight hundred nineteen thousand, seven hundred thirty-seven".