16683666685 has 16 divisors (see below), whose sum is σ = 22967467776. Its totient is φ = 11396723328.

The previous prime is 16683666647. The next prime is 16683666721. The reversal of 16683666685 is 58666638661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16683666685 - 2¹⁷ = 16683535613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 897024 + ... + 915433.

It is an arithmetic number, because the mean of its divisors is an integer number (1435466736).

Almost surely, 2^16683666685 is an apocalyptic number.

It is an amenable number.

16683666685 is a deficient number, since it is larger than the sum of its proper divisors (6283801091).

16683666685 is a wasteful number, since it uses less digits than its factorization.

16683666685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812732.

The product of its digits is 44789760, while the sum is 61.

The spelling of 16683666685 in words is "sixteen billion, six hundred eighty-three million, six hundred sixty-six thousand, six hundred eighty-five".