18219666804 has 12 divisors (see below), whose sum is σ = 42512555904. Its totient is φ = 6073222264.

The previous prime is 18219666779. The next prime is 18219666833. The reversal of 18219666804 is 40866691281.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 759152772 + ... + 759152795.

It is an arithmetic number, because the mean of its divisors is an integer number (3542712992).

Almost surely, 2^18219666804 is an apocalyptic number.

It is an amenable number.

18219666804 is an abundant number, since it is smaller than the sum of its proper divisors (24292889100).

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

18219666804 is a wasteful number, since it uses less digits than its factorization.

18219666804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518305574 (or 1518305572 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 18219666804 in words is "eighteen billion, two hundred nineteen million, six hundred sixty-six thousand, eight hundred four".