18685183687 has 2 divisors, whose sum is σ = 18685183688. Its totient is φ = 18685183686.

The previous prime is 18685183681. The next prime is 18685183697. The reversal of 18685183687 is 78638158681.

It is a weak prime.

It is an emirp because it is prime and its reverse (78638158681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18685183687 - 2²³ = 18676795079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18685183681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342591843 + 9342591844.

It is an arithmetic number, because the mean of its divisors is an integer number (9342591844).

Almost surely, 2^18685183687 is an apocalyptic number.

18685183687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685183687 is an equidigital number, since it uses as much as digits as its factorization.

18685183687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15482880, while the sum is 61.

The spelling of 18685183687 in words is "eighteen billion, six hundred eighty-five million, one hundred eighty-three thousand, six hundred eighty-seven".