1668499444 has 6 divisors (see below), whose sum is σ = 2919874034. Its totient is φ = 834249720.

The previous prime is 1668499411. The next prime is 1668499451. The reversal of 1668499444 is 4449948661.

It can be written as a sum of positive squares in only one way, i.e., 1327727844 + 340771600 = 36438^2 + 18460^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208562427 + ... + 208562434.

Almost surely, 2^1668499444 is an apocalyptic number.

It is an amenable number.

1668499444 is a deficient number, since it is larger than the sum of its proper divisors (1251374590).

1668499444 is a wasteful number, since it uses less digits than its factorization.

1668499444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417124865 (or 417124863 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 55.

The square root of 1668499444 is about 40847.2697251603. The cubic root of 1668499444 is about 1186.0655418508.

The spelling of 1668499444 in words is "one billion, six hundred sixty-eight million, four hundred ninety-nine thousand, four hundred forty-four".