18123539089 has 2 divisors, whose sum is σ = 18123539090. Its totient is φ = 18123539088.

The previous prime is 18123539069. The next prime is 18123539113. The reversal of 18123539089 is 98093532181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17834267025 + 289272064 = 133545^2 + 17008^2 .

It is a cyclic number.

It is not a de Polignac number, because 18123539089 - 2³³ = 9533604497 is a prime.

It is a super-2 number, since 2×18123539089² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18123539029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061769544 + 9061769545.

It is an arithmetic number, because the mean of its divisors is an integer number (9061769545).

Almost surely, 2^18123539089 is an apocalyptic number.

It is an amenable number.

18123539089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123539089 is an equidigital number, since it uses as much as digits as its factorization.

18123539089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 18123539089 in words is "eighteen billion, one hundred twenty-three million, five hundred thirty-nine thousand, eighty-nine".