12666780037729 has 2 divisors, whose sum is σ = 12666780037730. Its totient is φ = 12666780037728.

The previous prime is 12666780037531. The next prime is 12666780037741. The reversal of 12666780037729 is 92773008766621.

12666780037729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9921870010000 + 2744910027729 = 3149900^2 + 1656777^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666780037729 - 2²¹ = 12666777940577 is a prime.

It is not a weakly prime, because it can be changed into another prime (12666780037129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333390018864 + 6333390018865.

It is an arithmetic number, because the mean of its divisors is an integer number (6333390018865).

Almost surely, 2^{12666780037729} is an apocalyptic number.

It is an amenable number.

12666780037729 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666780037729 is an equidigital number, since it uses as much as digits as its factorization.

12666780037729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64012032, while the sum is 64.

The spelling of 12666780037729 in words is "twelve trillion, six hundred sixty-six billion, seven hundred eighty million, thirty-seven thousand, seven hundred twenty-nine".