1668576768 has 160 divisors (see below), whose sum is σ = 4709270016. Its totient is φ = 523911168.

The previous prime is 1668576731. The next prime is 1668576779. The reversal of 1668576768 is 8676758661.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2578621 + ... + 2579267.

Almost surely, 2^1668576768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668576768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2354635008).

1668576768 is an abundant number, since it is smaller than the sum of its proper divisors (3040693248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668576768 is an equidigital number, since it uses as much as digits as its factorization.

1668576768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 748 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 60.

The square root of 1668576768 is about 40848.2162156440. The cubic root of 1668576768 is about 1186.0838636859.

The spelling of 1668576768 in words is "one billion, six hundred sixty-eight million, five hundred seventy-six thousand, seven hundred sixty-eight".