6886136665 has 4 divisors (see below), whose sum is σ = 8263364004. Its totient is φ = 5508909328.

The previous prime is 6886136641. The next prime is 6886136701. The reversal of 6886136665 is 5666316886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1506060864 + 5380075801 = 38808^2 + 73349^2 .

It is a cyclic number.

It is not a de Polignac number, because 6886136665 - 2⁵ = 6886136633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 688613662 + ... + 688613671.

It is an arithmetic number, because the mean of its divisors is an integer number (2065841001).

Almost surely, 2^6886136665 is an apocalyptic number.

It is an amenable number.

6886136665 is a deficient number, since it is larger than the sum of its proper divisors (1377227339).

6886136665 is a wasteful number, since it uses less digits than its factorization.

6886136665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377227338.

The product of its digits is 7464960, while the sum is 55.

The square root of 6886136665 is about 82982.7492012647. The cubic root of 6886136665 is about 1902.5023966752.

The spelling of 6886136665 in words is "six billion, eight hundred eighty-six million, one hundred thirty-six thousand, six hundred sixty-five".