1668499989 has 12 divisors (see below), whose sum is σ = 2408959296. Its totient is φ = 1026768912.

The previous prime is 1668499981. The next prime is 1668499993. The reversal of 1668499989 is 9899948661.

It is not a de Polignac number, because 1668499989 - 2³ = 1668499981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668499981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1644957 + ... + 1645970.

It is an arithmetic number, because the mean of its divisors is an integer number (200746608).

Almost surely, 2^1668499989 is an apocalyptic number.

It is an amenable number.

1668499989 is a deficient number, since it is larger than the sum of its proper divisors (740459307).

1668499989 is a wasteful number, since it uses less digits than its factorization.

1668499989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290956 (or 3290943 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 69.

The square root of 1668499989 is about 40847.2763963523. The cubic root of 1668499989 is about 1186.0656709899.

The spelling of 1668499989 in words is "one billion, six hundred sixty-eight million, four hundred ninety-nine thousand, nine hundred eighty-nine".