18456993791 has 2 divisors, whose sum is σ = 18456993792. Its totient is φ = 18456993790.

The previous prime is 18456993613. The next prime is 18456993799. The reversal of 18456993791 is 19739965481.

It is a strong prime.

It is an emirp because it is prime and its reverse (19739965481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18456993791 - 2¹⁸ = 18456731647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18456993799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9228496895 + 9228496896.

It is an arithmetic number, because the mean of its divisors is an integer number (9228496896).

Almost surely, 2^18456993791 is an apocalyptic number.

18456993791 is a deficient number, since it is larger than the sum of its proper divisors (1).

18456993791 is an equidigital number, since it uses as much as digits as its factorization.

18456993791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 62.

The spelling of 18456993791 in words is "eighteen billion, four hundred fifty-six million, nine hundred ninety-three thousand, seven hundred ninety-one".