18006675978 has 64 divisors (see below), whose sum is σ = 38648897280. Its totient is φ = 5572841472.

The previous prime is 18006675899. The next prime is 18006675989. The reversal of 18006675978 is 87957660081.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4418950 + ... + 4423022.

It is an arithmetic number, because the mean of its divisors is an integer number (603889020).

Almost surely, 2^18006675978 is an apocalyptic number.

18006675978 is an abundant number, since it is smaller than the sum of its proper divisors (20642221302).

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

18006675978 is a wasteful number, since it uses less digits than its factorization.

18006675978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 18006675978 in words is "eighteen billion, six million, six hundred seventy-five thousand, nine hundred seventy-eight".