18066643 has 12 divisors (see below), whose sum is σ = 21102312. Its totient is φ = 15422400.

The previous prime is 18066611. The next prime is 18066679. The reversal of 18066643 is 34666081.

It is not a de Polignac number, because 18066643 - 2⁵ = 18066611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18066599 and 18066608.

It is not an unprimeable number, because it can be changed into a prime (18066743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14443 + ... + 15643.

It is an arithmetic number, because the mean of its divisors is an integer number (1758526).

Almost surely, 2^18066643 is an apocalyptic number.

18066643 is a deficient number, since it is larger than the sum of its proper divisors (3035669).

18066643 is a wasteful number, since it uses less digits than its factorization.

18066643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1515 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 18066643 is about 4250.4873838185. The cubic root of 18066643 is about 262.3971745417.

The spelling of 18066643 in words is "eighteen million, sixty-six thousand, six hundred forty-three".