18678756924349 has 2 divisors, whose sum is σ = 18678756924350. Its totient is φ = 18678756924348.

The previous prime is 18678756924301. The next prime is 18678756924379. The reversal of 18678756924349 is 94342965787681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11518353576900 + 7160403347449 = 3393870^2 + 2675893^2 .

It is a cyclic number.

It is not a de Polignac number, because 18678756924349 - 2⁷ = 18678756924221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18678756924379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9339378462174 + 9339378462175.

It is an arithmetic number, because the mean of its divisors is an integer number (9339378462175).

Almost surely, 2^{18678756924349} is an apocalyptic number.

It is an amenable number.

18678756924349 is a deficient number, since it is larger than the sum of its proper divisors (1).

18678756924349 is an equidigital number, since it uses as much as digits as its factorization.

18678756924349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4389396480, while the sum is 79.

The spelling of 18678756924349 in words is "eighteen trillion, six hundred seventy-eight billion, seven hundred fifty-six million, nine hundred twenty-four thousand, three hundred forty-nine".