18044847866 has 32 divisors (see below), whose sum is σ = 27659558592. Its totient is φ = 8827781760.

The previous prime is 18044847859. The next prime is 18044847889. The reversal of 18044847866 is 66874844081.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6184640 + ... + 6187556.

It is an arithmetic number, because the mean of its divisors is an integer number (864361206).

Almost surely, 2^18044847866 is an apocalyptic number.

18044847866 is a deficient number, since it is larger than the sum of its proper divisors (9614710726).

18044847866 is a wasteful number, since it uses less digits than its factorization.

18044847866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374.

The product of its (nonzero) digits is 8257536, while the sum is 56.

The spelling of 18044847866 in words is "eighteen billion, forty-four million, eight hundred forty-seven thousand, eight hundred sixty-six".