18166425 has 36 divisors (see below), whose sum is σ = 30984624. Its totient is φ = 9391200.

The previous prime is 18166397. The next prime is 18166429. The reversal of 18166425 is 52466181.

It is not a de Polignac number, because 18166425 - 2⁹ = 18165913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18166429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 138610 + ... + 138740.

It is an arithmetic number, because the mean of its divisors is an integer number (860684).

Almost surely, 2^18166425 is an apocalyptic number.

18166425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18166425 is a deficient number, since it is larger than the sum of its proper divisors (12818199).

18166425 is a wasteful number, since it uses less digits than its factorization.

18166425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 182 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 18166425 is about 4262.2089343438. The cubic root of 18166425 is about 262.8793607868.

The spelling of 18166425 in words is "eighteen million, one hundred sixty-six thousand, four hundred twenty-five".