18066547 has 4 divisors (see below), whose sum is σ = 18076720. Its totient is φ = 18056376.

The previous prime is 18066487. The next prime is 18066571. The reversal of 18066547 is 74566081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18066547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18066947) 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 3 ways as a sum of consecutive naturals, for example, 1647 + ... + 6232.

It is an arithmetic number, because the mean of its divisors is an integer number (4519180).

Almost surely, 2^18066547 is an apocalyptic number.

18066547 is a deficient number, since it is larger than the sum of its proper divisors (10173).

18066547 is an equidigital number, since it uses as much as digits as its factorization.

18066547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10172.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 18066547 is about 4250.4760909809. The cubic root of 18066547 is about 262.3967097777.

The spelling of 18066547 in words is "eighteen million, sixty-six thousand, five hundred forty-seven".