6512806729 has 12 divisors (see below), whose sum is σ = 7709376388. Its totient is φ = 5465291040.

The previous prime is 6512806723. The next prime is 6512806759. The reversal of 6512806729 is 9276082156.

It can be written as a sum of positive squares in 2 ways, for example, as 1717936704 + 4794870025 = 41448^2 + 69245^2 .

It is not a de Polignac number, because 6512806729 - 2³ = 6512806721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6512806721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2068614 + ... + 2071759.

Almost surely, 2^6512806729 is an apocalyptic number.

It is an amenable number.

6512806729 is a deficient number, since it is larger than the sum of its proper divisors (1196569659).

6512806729 is a wasteful number, since it uses less digits than its factorization.

6512806729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140408 (or 4140397 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 6512806729 is about 80701.9623615188. The cubic root of 6512806729 is about 1867.4804476256.

The spelling of 6512806729 in words is "six billion, five hundred twelve million, eight hundred six thousand, seven hundred twenty-nine".