18066013 has 4 divisors (see below), whose sum is σ = 20646880. Its totient is φ = 15485148.

The previous prime is 18066011. The next prime is 18066067. The reversal of 18066013 is 31066081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31066081 = 43 ⋅722467.

It is not a de Polignac number, because 18066013 - 2¹ = 18066011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18066011) 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, 1290423 + ... + 1290436.

It is an arithmetic number, because the mean of its divisors is an integer number (5161720).

Almost surely, 2^18066013 is an apocalyptic number.

It is an amenable number.

18066013 is a deficient number, since it is larger than the sum of its proper divisors (2580867).

18066013 is an equidigital number, since it uses as much as digits as its factorization.

18066013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580866.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18066013 is about 4250.4132740241. The cubic root of 18066013 is about 262.3941244982.

The spelling of 18066013 in words is "eighteen million, sixty-six thousand, thirteen".