18368739847 has 2 divisors, whose sum is σ = 18368739848. Its totient is φ = 18368739846.

The previous prime is 18368739833. The next prime is 18368739901. The reversal of 18368739847 is 74893786381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18368739847 - 2²³ = 18360351239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18368739247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9184369923 + 9184369924.

It is an arithmetic number, because the mean of its divisors is an integer number (9184369924).

Almost surely, 2^18368739847 is an apocalyptic number.

18368739847 is a deficient number, since it is larger than the sum of its proper divisors (1).

18368739847 is an equidigital number, since it uses as much as digits as its factorization.

18368739847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 64.

The spelling of 18368739847 in words is "eighteen billion, three hundred sixty-eight million, seven hundred thirty-nine thousand, eight hundred forty-seven".