6686787918 has 16 divisors (see below), whose sum is σ = 13436960256. Its totient is φ = 2218365240.

The previous prime is 6686787917. The next prime is 6686787923. The reversal of 6686787918 is 8197876866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686787917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2639646 + ... + 2642177.

It is an arithmetic number, because the mean of its divisors is an integer number (839810016).

Almost surely, 2^6686787918 is an apocalyptic number.

6686787918 is an abundant number, since it is smaller than the sum of its proper divisors (6750172338).

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

6686787918 is a wasteful number, since it uses less digits than its factorization.

6686787918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282039.

The product of its digits is 48771072, while the sum is 66.

The square root of 6686787918 is about 81772.7822566898. The cubic root of 6686787918 is about 1883.9636382333.

The spelling of 6686787918 in words is "six billion, six hundred eighty-six million, seven hundred eighty-seven thousand, nine hundred eighteen".