18538892861 has 2 divisors, whose sum is σ = 18538892862. Its totient is φ = 18538892860.

The previous prime is 18538892807. The next prime is 18538892891. The reversal of 18538892861 is 16829883581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13089648100 + 5449244761 = 114410^2 + 73819^2 .

It is a cyclic number.

It is not a de Polignac number, because 18538892861 - 2¹⁰ = 18538891837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18538892861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18538892891) 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, 9269446430 + 9269446431.

It is an arithmetic number, because the mean of its divisors is an integer number (9269446431).

Almost surely, 2^18538892861 is an apocalyptic number.

It is an amenable number.

18538892861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18538892861 is an equidigital number, since it uses as much as digits as its factorization.

18538892861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6635520, while the sum is 59.

The spelling of 18538892861 in words is "eighteen billion, five hundred thirty-eight million, eight hundred ninety-two thousand, eight hundred sixty-one".