6686943784 has 16 divisors (see below), whose sum is σ = 12942472320. Its totient is φ = 3235617840.

The previous prime is 6686943773. The next prime is 6686943787. The reversal of 6686943784 is 4873496866.

It is not an unprimeable number, because it can be changed into a prime (6686943787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13481494 + ... + 13481989.

It is an arithmetic number, because the mean of its divisors is an integer number (808904520).

Almost surely, 2^6686943784 is an apocalyptic number.

It is an amenable number.

6686943784 is a deficient number, since it is larger than the sum of its proper divisors (6255528536).

6686943784 is a wasteful number, since it uses less digits than its factorization.

6686943784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26963520 (or 26963516 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 61.

The square root of 6686943784 is about 81773.7352944086. The cubic root of 6686943784 is about 1883.9782762328.

The spelling of 6686943784 in words is "six billion, six hundred eighty-six million, nine hundred forty-three thousand, seven hundred eighty-four".