18991984014 has 36 divisors (see below), whose sum is σ = 43429053096. Its totient is φ = 5997466584.

The previous prime is 18991984003. The next prime is 18991984069. The reversal of 18991984014 is 41048919981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1454874 + ... + 1467869.

It is an arithmetic number, because the mean of its divisors is an integer number (1206362586).

Almost surely, 2^18991984014 is an apocalyptic number.

18991984014 is an abundant number, since it is smaller than the sum of its proper divisors (24437069082).

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

18991984014 is a wasteful number, since it uses less digits than its factorization.

18991984014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922789 (or 2922767 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The spelling of 18991984014 in words is "eighteen billion, nine hundred ninety-one million, nine hundred eighty-four thousand, fourteen".