18086555898 has 24 divisors (see below), whose sum is σ = 39292612788. Its totient is φ = 6012686592.

The previous prime is 18086555891. The next prime is 18086555917. The reversal of 18086555898 is 89855568081.

18086555898 is a `hidden beast` number, since 18 + 0 + 8 + 65 + 558 + 9 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17257288689 + 829267209 = 131367^2 + 28797^2 .

It is not an unprimeable number, because it can be changed into a prime (18086555891) 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 in 11 ways as a sum of consecutive naturals, for example, 1340215 + ... + 1353642.

Almost surely, 2^18086555898 is an apocalyptic number.

18086555898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18086555898 is an abundant number, since it is smaller than the sum of its proper divisors (21206056890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18086555898 is a wasteful number, since it uses less digits than its factorization.

18086555898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694238 (or 2694235 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 63.

The spelling of 18086555898 in words is "eighteen billion, eighty-six million, five hundred fifty-five thousand, eight hundred ninety-eight".