18768779591 has 2 divisors, whose sum is σ = 18768779592. Its totient is φ = 18768779590.

The previous prime is 18768779573. The next prime is 18768779599. The reversal of 18768779591 is 19597786781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18768779591 - 2²⁶ = 18701670727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18768779599) 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, 9384389795 + 9384389796.

It is an arithmetic number, because the mean of its divisors is an integer number (9384389796).

Almost surely, 2^18768779591 is an apocalyptic number.

18768779591 is a deficient number, since it is larger than the sum of its proper divisors (1).

18768779591 is an equidigital number, since it uses as much as digits as its factorization.

18768779591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53343360, while the sum is 68.

The spelling of 18768779591 in words is "eighteen billion, seven hundred sixty-eight million, seven hundred seventy-nine thousand, five hundred ninety-one".