16666683687 has 20 divisors (see below), whose sum is σ = 24959906136. Its totient is φ = 11083113360.

The previous prime is 16666683679. The next prime is 16666683713. The reversal of 16666683687 is 78638666661.

It is not a de Polignac number, because 16666683687 - 2³ = 16666683679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666683647) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 226989 + ... + 291302.

Almost surely, 2^16666683687 is an apocalyptic number.

16666683687 is a deficient number, since it is larger than the sum of its proper divisors (8293222449).

16666683687 is an equidigital number, since it uses as much as digits as its factorization.

16666683687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518700 (or 518691 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 16666683687 in words is "sixteen billion, six hundred sixty-six million, six hundred eighty-three thousand, six hundred eighty-seven".