18126666 has 20 divisors (see below), whose sum is σ = 40617522. Its totient is φ = 6042168.

The previous prime is 18126659. The next prime is 18126671. The reversal of 18126666 is 66662181.

It can be written as a sum of positive squares in only one way, i.e., 15046641 + 3080025 = 3879^2 + 1755^2 .

18126666 is a modest number, since divided by 6666 gives 1812 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 18126666.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 55785 + ... + 56108.

Almost surely, 2^18126666 is an apocalyptic number.

18126666 is an abundant number, since it is smaller than the sum of its proper divisors (22490856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18126666 is a wasteful number, since it uses less digits than its factorization.

18126666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111907 (or 111898 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18126666 is about 4257.5422487628. The cubic root of 18126666 is about 262.6874416331.

The spelling of 18126666 in words is "eighteen million, one hundred twenty-six thousand, six hundred sixty-six".