18166441 has 6 divisors (see below), whose sum is σ = 18815342. Its totient is φ = 17539200.

The previous prime is 18166433. The next prime is 18166453. The reversal of 18166441 is 14466181.

It can be written as a sum of positive squares in 3 ways, for example, as 6579225 + 11587216 = 2565^2 + 3404^2 .

It is not a de Polignac number, because 18166441 - 2³ = 18166433 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 (18166541) 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 5 ways as a sum of consecutive naturals, for example, 9960 + ... + 11641.

Almost surely, 2^18166441 is an apocalyptic number.

It is an amenable number.

18166441 is a deficient number, since it is larger than the sum of its proper divisors (648901).

18166441 is an equidigital number, since it uses as much as digits as its factorization.

18166441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21659 (or 21630 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 18166441 is about 4262.2108113044. The cubic root of 18166441 is about 262.8794379634.

The spelling of 18166441 in words is "eighteen million, one hundred sixty-six thousand, four hundred forty-one".