18800000861 has 2 divisors, whose sum is σ = 18800000862. Its totient is φ = 18800000860.

The previous prime is 18800000837. The next prime is 18800000873. The reversal of 18800000861 is 16800000881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12779172025 + 6020828836 = 113045^2 + 77594^2 .

It is a cyclic number.

It is not a de Polignac number, because 18800000861 - 2¹⁰ = 18799999837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18800000161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9400000430 + 9400000431.

It is an arithmetic number, because the mean of its divisors is an integer number (9400000431).

Almost surely, 2^18800000861 is an apocalyptic number.

It is an amenable number.

18800000861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18800000861 is an equidigital number, since it uses as much as digits as its factorization.

18800000861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 32.

The spelling of 18800000861 in words is "eighteen billion, eight hundred million, eight hundred sixty-one", and thus it is an aban number.