18976491967 has 2 divisors, whose sum is σ = 18976491968. Its totient is φ = 18976491966.

The previous prime is 18976491953. The next prime is 18976491971. The reversal of 18976491967 is 76919467981.

It is a strong prime.

It is an emirp because it is prime and its reverse (76919467981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18976491967 - 2²³ = 18968103359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18976491467) 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, 9488245983 + 9488245984.

It is an arithmetic number, because the mean of its divisors is an integer number (9488245984).

Almost surely, 2^18976491967 is an apocalyptic number.

18976491967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18976491967 is an equidigital number, since it uses as much as digits as its factorization.

18976491967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 67.

The spelling of 18976491967 in words is "eighteen billion, nine hundred seventy-six million, four hundred ninety-one thousand, nine hundred sixty-seven".