18091870085 has 8 divisors (see below), whose sum is σ = 21902370840. Its totient is φ = 14345411584.

The previous prime is 18091870021. The next prime is 18091870099. The reversal of 18091870085 is 58007819081.

It can be written as a sum of positive squares in 4 ways, for example, as 599956036 + 17491914049 = 24494^2 + 132257^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18091870085 - 2⁶ = 18091870021 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16009940 + ... + 16011069.

It is an arithmetic number, because the mean of its divisors is an integer number (2737796355).

Almost surely, 2^18091870085 is an apocalyptic number.

It is an amenable number.

18091870085 is a deficient number, since it is larger than the sum of its proper divisors (3810500755).

18091870085 is a wasteful number, since it uses less digits than its factorization.

18091870085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32021127.

The product of its (nonzero) digits is 161280, while the sum is 47.

The spelling of 18091870085 in words is "eighteen billion, ninety-one million, eight hundred seventy thousand, eighty-five".