6518012809 has 32 divisors (see below), whose sum is σ = 8273970432. Its totient is φ = 4987008000.

The previous prime is 6518012801. The next prime is 6518012821. The reversal of 6518012809 is 9082108156.

It is a cyclic number.

It is not a de Polignac number, because 6518012809 - 2³ = 6518012801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6518012801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4400349 + ... + 4401829.

It is an arithmetic number, because the mean of its divisors is an integer number (258561576).

Almost surely, 2^6518012809 is an apocalyptic number.

It is an amenable number.

6518012809 is a deficient number, since it is larger than the sum of its proper divisors (1755957623).

6518012809 is a wasteful number, since it uses less digits than its factorization.

6518012809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 6518012809 is about 80734.2108960012. The cubic root of 6518012809 is about 1867.9779117572.

The spelling of 6518012809 in words is "six billion, five hundred eighteen million, twelve thousand, eight hundred nine".