18878093161709 has 2 divisors, whose sum is σ = 18878093161710. Its totient is φ = 18878093161708.

The previous prime is 18878093161703. The next prime is 18878093161717. The reversal of 18878093161709 is 90716139087881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11617170109609 + 7260923052100 = 3408397^2 + 2694610^2 .

It is a cyclic number.

It is not a de Polignac number, because 18878093161709 - 2³² = 18873798194413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18878093161703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439046580854 + 9439046580855.

It is an arithmetic number, because the mean of its divisors is an integer number (9439046580855).

Almost surely, 2^{18878093161709} is an apocalyptic number.

It is an amenable number.

18878093161709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878093161709 is an equidigital number, since it uses as much as digits as its factorization.

18878093161709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36578304, while the sum is 68.

The spelling of 18878093161709 in words is "eighteen trillion, eight hundred seventy-eight billion, ninety-three million, one hundred sixty-one thousand, seven hundred nine".