18768199687 has 2 divisors, whose sum is σ = 18768199688. Its totient is φ = 18768199686.

The previous prime is 18768199679. The next prime is 18768199727. The reversal of 18768199687 is 78699186781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18768199687 - 2³ = 18768199679 is a prime.

It is a super-2 number, since 2×18768199687² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18768197687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9384099843 + 9384099844.

It is an arithmetic number, because the mean of its divisors is an integer number (9384099844).

Almost surely, 2^18768199687 is an apocalyptic number.

18768199687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18768199687 is an equidigital number, since it uses as much as digits as its factorization.

18768199687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 70.

The spelling of 18768199687 in words is "eighteen billion, seven hundred sixty-eight million, one hundred ninety-nine thousand, six hundred eighty-seven".