6504916561 has 12 divisors (see below), whose sum is σ = 7700036596. Its totient is φ = 5458669920.

The previous prime is 6504916559. The next prime is 6504916619. The reversal of 6504916561 is 1656194056.

It can be written as a sum of positive squares in 2 ways, for example, as 1242139536 + 5262777025 = 35244^2 + 72545^2 .

It is not a de Polignac number, because 6504916561 - 2¹ = 6504916559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6504916501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2066106 + ... + 2069251.

Almost surely, 2^6504916561 is an apocalyptic number.

It is an amenable number.

6504916561 is a deficient number, since it is larger than the sum of its proper divisors (1195120035).

6504916561 is a wasteful number, since it uses less digits than its factorization.

6504916561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135392 (or 4135381 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 6504916561 is about 80653.0629362580. The cubic root of 6504916561 is about 1866.7260013275.

The spelling of 6504916561 in words is "six billion, five hundred four million, nine hundred sixteen thousand, five hundred sixty-one".