1668628686 has 16 divisors (see below), whose sum is σ = 3408263424. Its totient is φ = 544375224.

The previous prime is 1668628667. The next prime is 1668628711. The reversal of 1668628686 is 6868268661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2958280 + ... + 2958843.

It is an arithmetic number, because the mean of its divisors is an integer number (213016464).

Almost surely, 2^1668628686 is an apocalyptic number.

1668628686 is an abundant number, since it is smaller than the sum of its proper divisors (1739634738).

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

1668628686 is a wasteful number, since it uses less digits than its factorization.

1668628686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5917175.

The product of its digits is 7962624, while the sum is 57.

The square root of 1668628686 is about 40848.8517096870. The cubic root of 1668628686 is about 1186.0961652802.

The spelling of 1668628686 in words is "one billion, six hundred sixty-eight million, six hundred twenty-eight thousand, six hundred eighty-six".