18066663 has 12 divisors (see below), whose sum is σ = 27470040. Its totient is φ = 11410416.

The previous prime is 18066611. The next prime is 18066679. The reversal of 18066663 is 36666081.

It is not a de Polignac number, because 18066663 - 2⁶ = 18066599 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18066463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52656 + ... + 52997.

It is an arithmetic number, because the mean of its divisors is an integer number (2289170).

Almost surely, 2^18066663 is an apocalyptic number.

18066663 is a deficient number, since it is larger than the sum of its proper divisors (9403377).

18066663 is a wasteful number, since it uses less digits than its factorization.

18066663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105678 (or 105675 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 18066663 is about 4250.4897364892. The cubic root of 18066663 is about 262.3972713673.

The spelling of 18066663 in words is "eighteen million, sixty-six thousand, six hundred sixty-three".