16851666685 has 48 divisors (see below), whose sum is σ = 23814190512. Its totient is φ = 11413248000.

The previous prime is 16851666679. The next prime is 16851666697. The reversal of 16851666685 is 58666615861.

It can be written as a sum of positive squares in 8 ways, for example, as 800550436 + 16051116249 = 28294^2 + 126693^2 .

It is not a de Polignac number, because 16851666685 - 2¹⁵ = 16851633917 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19127445 + ... + 19128325.

It is an arithmetic number, because the mean of its divisors is an integer number (496128969).

Almost surely, 2^16851666685 is an apocalyptic number.

It is an amenable number.

16851666685 is a deficient number, since it is larger than the sum of its proper divisors (6962523827).

16851666685 is a wasteful number, since it uses less digits than its factorization.

16851666685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774 (or 1767 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 58.

The spelling of 16851666685 in words is "sixteen billion, eight hundred fifty-one million, six hundred sixty-six thousand, six hundred eighty-five".