18666325 has 6 divisors (see below), whose sum is σ = 23146274. Its totient is φ = 14933040.

The previous prime is 18666313. The next prime is 18666331. The reversal of 18666325 is 52366681.

It can be written as a sum of positive squares in 3 ways, for example, as 4028049 + 14638276 = 2007^2 + 3826^2 .

It is not a de Polignac number, because 18666325 - 2⁵ = 18666293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 373302 + ... + 373351.

Almost surely, 2^18666325 is an apocalyptic number.

It is an amenable number.

18666325 is a deficient number, since it is larger than the sum of its proper divisors (4479949).

18666325 is an equidigital number, since it uses as much as digits as its factorization.

18666325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746663 (or 746658 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 18666325 is about 4320.4542585242. The cubic root of 18666325 is about 265.2688620508.

The spelling of 18666325 in words is "eighteen million, six hundred sixty-six thousand, three hundred twenty-five".