18066533 has 4 divisors (see below), whose sum is σ = 18087360. Its totient is φ = 18045708.

The previous prime is 18066487. The next prime is 18066571. The reversal of 18066533 is 33566081.

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: 33566081 = 769 ⋅43649.

It is a cyclic number.

It is not a de Polignac number, because 18066533 - 2⁸ = 18066277 is a prime.

It is a super-2 number, since 2×18066533² = 652799229280178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18066533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18066593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9053 + ... + 10866.

It is an arithmetic number, because the mean of its divisors is an integer number (4521840).

Almost surely, 2^18066533 is an apocalyptic number.

It is an amenable number.

18066533 is a deficient number, since it is larger than the sum of its proper divisors (20827).

18066533 is an equidigital number, since it uses as much as digits as its factorization.

18066533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20826.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 18066533 is about 4250.4744441062. The cubic root of 18066533 is about 262.3966419995.

The spelling of 18066533 in words is "eighteen million, sixty-six thousand, five hundred thirty-three".