18666925 has 6 divisors (see below), whose sum is σ = 23147018. Its totient is φ = 14933520.

The previous prime is 18666919. The next prime is 18666941. The reversal of 18666925 is 52966681.

It can be written as a sum of positive squares in 3 ways, for example, as 850084 + 17816841 = 922^2 + 4221^2 .

It is not a de Polignac number, because 18666925 - 2³ = 18666917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 373314 + ... + 373363.

Almost surely, 2^18666925 is an apocalyptic number.

It is an amenable number.

18666925 is a deficient number, since it is larger than the sum of its proper divisors (4480093).

18666925 is an equidigital number, since it uses as much as digits as its factorization.

18666925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746687 (or 746682 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 18666925 is about 4320.5236951092. The cubic root of 18666925 is about 265.2717042388.

It can be divided in two parts, 18666 and 925, that added together give a palindrome (19591).

The spelling of 18666925 in words is "eighteen million, six hundred sixty-six thousand, nine hundred twenty-five".