18618066 has 32 divisors (see below), whose sum is σ = 41949120. Its totient is φ = 6119712.

The previous prime is 18618053. The next prime is 18618071. The reversal of 18618066 is 66081681.

It is a self number, because there is not a number n which added to its sum of digits gives 18618066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1581 + ... + 6303.

It is an arithmetic number, because the mean of its divisors is an integer number (1310910).

Almost surely, 2^18618066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18618066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20974560).

18618066 is an abundant number, since it is smaller than the sum of its proper divisors (23331054).

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

18618066 is a wasteful number, since it uses less digits than its factorization.

18618066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4807 (or 4801 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18618066 is about 4314.8656989529. The cubic root of 18618066 is about 265.0400603968.

The spelling of 18618066 in words is "eighteen million, six hundred eighteen thousand, sixty-six".