6513435641 has 16 divisors (see below), whose sum is σ = 7175725200. Its totient is φ = 5884612608.

The previous prime is 6513435631. The next prime is 6513435667. The reversal of 6513435641 is 1465343156.

It can be written as a sum of positive squares in 8 ways, for example, as 476767225 + 6036668416 = 21835^2 + 77696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6513435641 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6513435595 and 6513435604.

It is not an unprimeable number, because it can be changed into a prime (6513435631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47105 + ... + 123473.

It is an arithmetic number, because the mean of its divisors is an integer number (448482825).

Almost surely, 2^6513435641 is an apocalyptic number.

It is an amenable number.

6513435641 is a deficient number, since it is larger than the sum of its proper divisors (662289559).

6513435641 is a wasteful number, since it uses less digits than its factorization.

6513435641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76588.

The product of its digits is 129600, while the sum is 38.

The square root of 6513435641 is about 80705.8587774147. The cubic root of 6513435641 is about 1867.5405570433.

Adding to 6513435641 its reverse (1465343156), we get a palindrome (7978778797).

The spelling of 6513435641 in words is "six billion, five hundred thirteen million, four hundred thirty-five thousand, six hundred forty-one".