6686513 has 4 divisors (see below), whose sum is σ = 6726720. Its totient is φ = 6646308.

The previous prime is 6686509. The next prime is 6686527. The reversal of 6686513 is 3156866.

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 6686513 - 2² = 6686509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6686213) 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, 19853 + ... + 20186.

It is an arithmetic number, because the mean of its divisors is an integer number (1681680).

Almost surely, 2^6686513 is an apocalyptic number.

It is an amenable number.

6686513 is a deficient number, since it is larger than the sum of its proper divisors (40207).

6686513 is a wasteful number, since it uses less digits than its factorization.

6686513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40206.

The product of its digits is 25920, while the sum is 35.

The square root of 6686513 is about 2585.8292673725. The cubic root of 6686513 is about 188.3937819030.

The spelling of 6686513 in words is "six million, six hundred eighty-six thousand, five hundred thirteen".