18766798849 has 2 divisors, whose sum is σ = 18766798850. Its totient is φ = 18766798848.

The previous prime is 18766798837. The next prime is 18766798861. The reversal of 18766798849 is 94889766781.

It is a balanced prime because it is at equal distance from previous prime (18766798837) and next prime (18766798861).

It can be written as a sum of positive squares in only one way, i.e., 12693402225 + 6073396624 = 112665^2 + 77932^2 .

It is an emirp because it is prime and its reverse (94889766781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18766798849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18766798889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9383399424 + 9383399425.

It is an arithmetic number, because the mean of its divisors is an integer number (9383399425).

Almost surely, 2^18766798849 is an apocalyptic number.

It is an amenable number.

18766798849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18766798849 is an equidigital number, since it uses as much as digits as its factorization.

18766798849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 292626432, while the sum is 73.

The spelling of 18766798849 in words is "eighteen billion, seven hundred sixty-six million, seven hundred ninety-eight thousand, eight hundred forty-nine".