18019669985 has 8 divisors (see below), whose sum is σ = 21720572160. Its totient is φ = 14351090544.

The previous prime is 18019669981. The next prime is 18019669991. The reversal of 18019669985 is 58996691081.

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 18019669985 - 2² = 18019669981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18019669981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8079455 + ... + 8081684.

It is an arithmetic number, because the mean of its divisors is an integer number (2715071520).

Almost surely, 2^18019669985 is an apocalyptic number.

It is an amenable number.

18019669985 is a deficient number, since it is larger than the sum of its proper divisors (3700902175).

18019669985 is a wasteful number, since it uses less digits than its factorization.

18019669985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16161367.

The product of its (nonzero) digits is 8398080, while the sum is 62.

The spelling of 18019669985 in words is "eighteen billion, nineteen million, six hundred sixty-nine thousand, nine hundred eighty-five".