18461666 has 8 divisors (see below), whose sum is σ = 27714540. Its totient is φ = 9223488.

The previous prime is 18461659. The next prime is 18461669. The reversal of 18461666 is 66616481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18447025 + 14641 = 4295^2 + 121^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18461666² = 681666222991112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18461669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350 + ... + 6086.

Almost surely, 2^18461666 is an apocalyptic number.

18461666 is a deficient number, since it is larger than the sum of its proper divisors (9252874).

18461666 is a wasteful number, since it uses less digits than its factorization.

18461666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7348.

The product of its digits is 41472, while the sum is 38.

The square root of 18461666 is about 4296.7040856917. The cubic root of 18461666 is about 264.2958212142.

The spelling of 18461666 in words is "eighteen million, four hundred sixty-one thousand, six hundred sixty-six".