18766798837 has 2 divisors, whose sum is σ = 18766798838. Its totient is φ = 18766798836.

The previous prime is 18766798793. The next prime is 18766798849. The reversal of 18766798837 is 73889766781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17752631121 + 1014167716 = 133239^2 + 31846^2 .

It is a cyclic number.

It is not a de Polignac number, because 18766798837 - 2²⁷ = 18632581109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18766798867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9383399418 + 9383399419.

It is an arithmetic number, because the mean of its divisors is an integer number (9383399419).

Almost surely, 2^18766798837 is an apocalyptic number.

It is an amenable number.

18766798837 is a deficient number, since it is larger than the sum of its proper divisors (1).

18766798837 is an equidigital number, since it uses as much as digits as its factorization.

18766798837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170698752, while the sum is 70.

The spelling of 18766798837 in words is "eighteen billion, seven hundred sixty-six million, seven hundred ninety-eight thousand, eight hundred thirty-seven".