6513564961 has 4 divisors (see below), whose sum is σ = 6552568512. Its totient is φ = 6474561412.

The previous prime is 6513564899. The next prime is 6513564979. The reversal of 6513564961 is 1694653156.

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 a de Polignac number, because none of the positive numbers 2^k-6513564961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6513564991) 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, 19501525 + ... + 19501858.

It is an arithmetic number, because the mean of its divisors is an integer number (1638142128).

Almost surely, 2^6513564961 is an apocalyptic number.

It is an amenable number.

6513564961 is a deficient number, since it is larger than the sum of its proper divisors (39003551).

6513564961 is a wasteful number, since it uses less digits than its factorization.

6513564961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39003550.

The product of its digits is 583200, while the sum is 46.

The square root of 6513564961 is about 80706.6599544300. The cubic root of 6513564961 is about 1867.5529165598.

The spelling of 6513564961 in words is "six billion, five hundred thirteen million, five hundred sixty-four thousand, nine hundred sixty-one".