18774166866 has 128 divisors (see below), whose sum is σ = 47872720896. Its totient is φ = 4774775040.

The previous prime is 18774166843. The next prime is 18774166871. The reversal of 18774166866 is 66866147781.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5194476 + ... + 5198088.

It is an arithmetic number, because the mean of its divisors is an integer number (374005632).

Almost surely, 2^18774166866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18774166866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23936360448).

18774166866 is an abundant number, since it is smaller than the sum of its proper divisors (29098554030).

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

18774166866 is a wasteful number, since it uses less digits than its factorization.

18774166866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976.

The product of its digits is 16257024, while the sum is 60.

The spelling of 18774166866 in words is "eighteen billion, seven hundred seventy-four million, one hundred sixty-six thousand, eight hundred sixty-six".