18768686819 has 2 divisors, whose sum is σ = 18768686820. Its totient is φ = 18768686818.

The previous prime is 18768686777. The next prime is 18768686843. The reversal of 18768686819 is 91868686781.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18768686819 is a prime.

It is a super-2 number, since 2×18768686819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18768686879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9384343409 + 9384343410.

It is an arithmetic number, because the mean of its divisors is an integer number (9384343410).

Almost surely, 2^18768686819 is an apocalyptic number.

18768686819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18768686819 is an equidigital number, since it uses as much as digits as its factorization.

18768686819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55738368, while the sum is 68.

The spelling of 18768686819 in words is "eighteen billion, seven hundred sixty-eight million, six hundred eighty-six thousand, eight hundred nineteen".