6518 has 4 divisors (see below), whose sum is σ = 9780. Its totient is φ = 3258.

The previous prime is 6491. The next prime is 6521. The reversal of 6518 is 8156.

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

It is a Curzon number.

It is a plaindrome in base 8.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 6518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1628 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (2445).

2⁶⁵¹⁸ is an apocalyptic number.

6518 is a deficient number, since it is larger than the sum of its proper divisors (3262).

6518 is a wasteful number, since it uses less digits than its factorization.

6518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261.

The product of its digits is 240, while the sum is 20.

The square root of 6518 is about 80.7341315678. The cubic root of 6518 is about 18.6797668813.

The spelling of 6518 in words is "six thousand, five hundred eighteen".