18919583791 has 2 divisors, whose sum is σ = 18919583792. Its totient is φ = 18919583790.

The previous prime is 18919583723. The next prime is 18919583833. The reversal of 18919583791 is 19738591981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18919583791 - 2¹⁵ = 18919551023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18919584791) 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, 9459791895 + 9459791896.

It is an arithmetic number, because the mean of its divisors is an integer number (9459791896).

Almost surely, 2^18919583791 is an apocalyptic number.

18919583791 is a deficient number, since it is larger than the sum of its proper divisors (1).

18919583791 is an equidigital number, since it uses as much as digits as its factorization.

18919583791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 61.

The spelling of 18919583791 in words is "eighteen billion, nine hundred nineteen million, five hundred eighty-three thousand, seven hundred ninety-one".