13780727861 has 2 divisors, whose sum is σ = 13780727862. Its totient is φ = 13780727860.

The previous prime is 13780727839. The next prime is 13780727869. The reversal of 13780727861 is 16872708731.

It is a happy number.

13780727861 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., 13476888100 + 303839761 = 116090^2 + 17431^2 .

It is a cyclic number.

It is not a de Polignac number, because 13780727861 - 2³⁰ = 12706986037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13780727869) 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 as a sum of consecutive naturals, namely, 6890363930 + 6890363931.

It is an arithmetic number, because the mean of its divisors is an integer number (6890363931).

Almost surely, 2^13780727861 is an apocalyptic number.

It is an amenable number.

13780727861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13780727861 is an equidigital number, since it uses as much as digits as its factorization.

13780727861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 13780727861 in words is "thirteen billion, seven hundred eighty million, seven hundred twenty-seven thousand, eight hundred sixty-one".