1668435172 has 12 divisors (see below), whose sum is σ = 2920096816. Its totient is φ = 834121800.

The previous prime is 1668435149. The next prime is 1668435173. The reversal of 1668435172 is 2715348661.

It is not an unprimeable number, because it can be changed into a prime (1668435173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27547 + ... + 63997.

Almost surely, 2^1668435172 is an apocalyptic number.

It is an amenable number.

1668435172 is a deficient number, since it is larger than the sum of its proper divisors (1251661644).

1668435172 is a wasteful number, since it uses less digits than its factorization.

1668435172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47898 (or 47896 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 1668435172 is about 40846.4829820145. The cubic root of 1668435172 is about 1186.0503122416.

The spelling of 1668435172 in words is "one billion, six hundred sixty-eight million, four hundred thirty-five thousand, one hundred seventy-two".