1666668888687 has 24 divisors (see below), whose sum is σ = 2447506432000. Its totient is φ = 1008077994000.

The previous prime is 1666668888673. The next prime is 1666668888697. The reversal of 1666668888687 is 7868888666661.

It is not a de Polignac number, because 1666668888687 - 2¹¹ = 1666668886639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666668888607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4419439 + ... + 4781712.

Almost surely, 2^{1666668888687} is an apocalyptic number.

1666668888687 is a deficient number, since it is larger than the sum of its proper divisors (780837543313).

1666668888687 is a wasteful number, since it uses less digits than its factorization.

1666668888687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9201675 (or 9201664 counting only the distinct ones).

The product of its digits is 10701766656, while the sum is 84.

The spelling of 1666668888687 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-eight million, eight hundred eighty-eight thousand, six hundred eighty-seven".