18985430668 has 12 divisors (see below), whose sum is σ = 33244140160. Its totient is φ = 9487104912.

The previous prime is 18985430627. The next prime is 18985430729. The reversal of 18985430668 is 86603458981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394988 + ... + 1408531.

Almost surely, 2^18985430668 is an apocalyptic number.

It is an amenable number.

18985430668 is a deficient number, since it is larger than the sum of its proper divisors (14258709492).

18985430668 is a wasteful number, since it uses less digits than its factorization.

18985430668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805216 (or 2805214 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 58.

The spelling of 18985430668 in words is "eighteen billion, nine hundred eighty-five million, four hundred thirty thousand, six hundred sixty-eight".