1668663 has 12 divisors (see below), whose sum is σ = 2475928. Its totient is φ = 1082160.

The previous prime is 1668649. The next prime is 1668679. The reversal of 1668663 is 3668661.

It is not a de Polignac number, because 1668663 - 2⁴ = 1668647 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 (1668683) 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 11 ways as a sum of consecutive naturals, for example, 2173 + ... + 2838.

2^1668663 is an apocalyptic number.

1668663 is a deficient number, since it is larger than the sum of its proper divisors (807265).

1668663 is a wasteful number, since it uses less digits than its factorization.

1668663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054 (or 5051 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1668663 is about 1291.7673939220. The cubic root of 1668663 is about 118.6104295594.

The spelling of 1668663 in words is "one million, six hundred sixty-eight thousand, six hundred sixty-three".