18810084889 has 2 divisors, whose sum is σ = 18810084890. Its totient is φ = 18810084888.

The previous prime is 18810084869. The next prime is 18810084899. The reversal of 18810084889 is 98848001881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9494553600 + 9315531289 = 97440^2 + 96517^2 .

It is a cyclic number.

It is not a de Polignac number, because 18810084889 - 2⁵ = 18810084857 is a prime.

It is a super-2 number, since 2×18810084889² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18810084829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405042444 + 9405042445.

It is an arithmetic number, because the mean of its divisors is an integer number (9405042445).

Almost surely, 2^18810084889 is an apocalyptic number.

It is an amenable number.

18810084889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18810084889 is an equidigital number, since it uses as much as digits as its factorization.

18810084889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1179648, while the sum is 55.

The spelling of 18810084889 in words is "eighteen billion, eight hundred ten million, eighty-four thousand, eight hundred eighty-nine".