6513632561 has 8 divisors (see below), whose sum is σ = 6692779104. Its totient is φ = 6335743680.

The previous prime is 6513632557. The next prime is 6513632639. The reversal of 6513632561 is 1652363156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6513632561 - 2² = 6513632557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6513631561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303911 + ... + 324636.

It is an arithmetic number, because the mean of its divisors is an integer number (836597388).

Almost surely, 2^6513632561 is an apocalyptic number.

It is an amenable number.

6513632561 is a deficient number, since it is larger than the sum of its proper divisors (179146543).

6513632561 is a wasteful number, since it uses less digits than its factorization.

6513632561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628831.

The product of its digits is 97200, while the sum is 38.

The square root of 6513632561 is about 80707.0787539730. The cubic root of 6513632561 is about 1867.5593772380.

The spelling of 6513632561 in words is "six billion, five hundred thirteen million, six hundred thirty-two thousand, five hundred sixty-one".