18998120085 has 64 divisors (see below), whose sum is σ = 35714241024. Its totient is φ = 8441625600.

The previous prime is 18998120059. The next prime is 18998120161. The reversal of 18998120085 is 58002189981.

It is not a de Polignac number, because 18998120085 - 2¹⁰ = 18998119061 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5363415 + ... + 5366955.

It is an arithmetic number, because the mean of its divisors is an integer number (558035016).

Almost surely, 2^18998120085 is an apocalyptic number.

18998120085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18998120085 is a deficient number, since it is larger than the sum of its proper divisors (16716120939).

18998120085 is a wasteful number, since it uses less digits than its factorization.

18998120085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974.

The product of its (nonzero) digits is 414720, while the sum is 51.

The spelling of 18998120085 in words is "eighteen billion, nine hundred ninety-eight million, one hundred twenty thousand, eighty-five".