6683681 has 4 divisors (see below), whose sum is σ = 6721200. Its totient is φ = 6646164.

The previous prime is 6683641. The next prime is 6683689. The reversal of 6683681 is 1863866.

6683681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1863866 = 2 ⋅931933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6683681 is a prime.

It is a super-2 number, since 2×6683681² = 89343183419522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6683689) 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, 18491 + ... + 18848.

It is an arithmetic number, because the mean of its divisors is an integer number (1680300).

Almost surely, 2^6683681 is an apocalyptic number.

It is an amenable number.

6683681 is a deficient number, since it is larger than the sum of its proper divisors (37519).

6683681 is a wasteful number, since it uses less digits than its factorization.

6683681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37518.

The product of its digits is 41472, while the sum is 38.

The square root of 6683681 is about 2585.2816094190. The cubic root of 6683681 is about 188.3671807666.

The spelling of 6683681 in words is "six million, six hundred eighty-three thousand, six hundred eighty-one".