18188860866 has 64 divisors (see below), whose sum is σ = 40217748480. Its totient is φ = 5437938240.

The previous prime is 18188860861. The next prime is 18188860909. The reversal of 18188860866 is 66806888181.

It is not an unprimeable number, because it can be changed into a prime (18188860861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5032476 + ... + 5036088.

It is an arithmetic number, because the mean of its divisors is an integer number (628402320).

Almost surely, 2^18188860866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18188860866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20108874240).

18188860866 is an abundant number, since it is smaller than the sum of its proper divisors (22028887614).

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

18188860866 is a wasteful number, since it uses less digits than its factorization.

18188860866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631.

The product of its (nonzero) digits is 7077888, while the sum is 60.

The spelling of 18188860866 in words is "eighteen billion, one hundred eighty-eight million, eight hundred sixty thousand, eight hundred sixty-six".