1668512889 has 36 divisors (see below), whose sum is σ = 2567969040. Its totient is φ = 1043729280.

The previous prime is 1668512887. The next prime is 1668512899. The reversal of 1668512889 is 9882158661.

It is a happy number.

It is not a de Polignac number, because 1668512889 - 2¹ = 1668512887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668512887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1089054 + ... + 1090584.

Almost surely, 2^1668512889 is an apocalyptic number.

It is an amenable number.

1668512889 is a deficient number, since it is larger than the sum of its proper divisors (899456151).

1668512889 is a wasteful number, since it uses less digits than its factorization.

1668512889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990 (or 1970 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 1668512889 is about 40847.4343013120. The cubic root of 1668512889 is about 1186.0687276691.

The spelling of 1668512889 in words is "one billion, six hundred sixty-eight million, five hundred twelve thousand, eight hundred eighty-nine".