18166469 has 2 divisors, whose sum is σ = 18166470. Its totient is φ = 18166468.

The previous prime is 18166457. The next prime is 18166483. The reversal of 18166469 is 96466181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 315844 = 4225^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 18166469 - 2⁴ = 18166453 is a prime.

It is a super-2 number, since 2×18166469² = 660041191855922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 9083234 + 9083235.

It is an arithmetic number, because the mean of its divisors is an integer number (9083235).

Almost surely, 2^18166469 is an apocalyptic number.

It is an amenable number.

18166469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18166469 is an equidigital number, since it uses as much as digits as its factorization.

18166469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 18166469 is about 4262.2140959834. The cubic root of 18166469 is about 262.8795730224.

The spelling of 18166469 in words is "eighteen million, one hundred sixty-six thousand, four hundred sixty-nine".