6881665 has 16 divisors (see below), whose sum is σ = 9539712. Its totient is φ = 4667904.

The previous prime is 6881663. The next prime is 6881683. The reversal of 6881665 is 5661886.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6881665 - 2¹ = 6881663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6881663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2382 + ... + 4408.

It is an arithmetic number, because the mean of its divisors is an integer number (596232).

Almost surely, 2^6881665 is an apocalyptic number.

It is an amenable number.

6881665 is a deficient number, since it is larger than the sum of its proper divisors (2658047).

6881665 is a wasteful number, since it uses less digits than its factorization.

6881665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136.

The product of its digits is 69120, while the sum is 40.

The square root of 6881665 is about 2623.2927781702. The cubic root of 6881665 is about 190.2090496847.

The spelling of 6881665 in words is "six million, eight hundred eighty-one thousand, six hundred sixty-five".