1666466 has 8 divisors (see below), whose sum is σ = 2506140. Its totient is φ = 831088.

The previous prime is 1666447. The next prime is 1666477. The reversal of 1666466 is 6646661.

It can be written as a sum of positive squares in 2 ways, for example, as 1635841 + 30625 = 1279^2 + 175^2 .

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

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 200 + ... + 1836.

2^1666466 is an apocalyptic number.

1666466 is a deficient number, since it is larger than the sum of its proper divisors (839674).

1666466 is a wasteful number, since it uses less digits than its factorization.

1666466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148.

The product of its digits is 31104, while the sum is 35.

The square root of 1666466 is about 1290.9167285305. The cubic root of 1666466 is about 118.5583516259.

The spelling of 1666466 in words is "one million, six hundred sixty-six thousand, four hundred sixty-six".