18698117719 has 2 divisors, whose sum is σ = 18698117720. Its totient is φ = 18698117718.

The previous prime is 18698117717. The next prime is 18698117783. The reversal of 18698117719 is 91771189681.

It is a weak prime.

It is an emirp because it is prime and its reverse (91771189681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18698117719 - 2¹ = 18698117717 is a prime.

It is a super-2 number, since 2×18698117719² (a number of 21 digits) contains 22 as substring.

Together with 18698117717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18698117717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9349058859 + 9349058860.

It is an arithmetic number, because the mean of its divisors is an integer number (9349058860).

Almost surely, 2^18698117719 is an apocalyptic number.

18698117719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18698117719 is an equidigital number, since it uses as much as digits as its factorization.

18698117719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 58.

The spelling of 18698117719 in words is "eighteen billion, six hundred ninety-eight million, one hundred seventeen thousand, seven hundred nineteen".