6686947689 has 4 divisors (see below), whose sum is σ = 8915930256. Its totient is φ = 4457965124.

The previous prime is 6686947667. The next prime is 6686947691. The reversal of 6686947689 is 9867496866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6686947689 - 2¹⁵ = 6686914921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6686947639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114491279 + ... + 1114491284.

It is an arithmetic number, because the mean of its divisors is an integer number (2228982564).

Almost surely, 2^6686947689 is an apocalyptic number.

It is an amenable number.

6686947689 is a deficient number, since it is larger than the sum of its proper divisors (2228982567).

6686947689 is a wasteful number, since it uses less digits than its factorization.

6686947689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228982566.

The product of its digits is 188116992, while the sum is 69.

The square root of 6686947689 is about 81773.7591712647. The cubic root of 6686947689 is about 1883.9786429641.

The spelling of 6686947689 in words is "six billion, six hundred eighty-six million, nine hundred forty-seven thousand, six hundred eighty-nine".