6493616813 has 4 divisors (see below), whose sum is σ = 6495156540. Its totient is φ = 6492077088.

The previous prime is 6493616783. The next prime is 6493616827. The reversal of 6493616813 is 3186163946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5440095049 + 1053521764 = 73757^2 + 32458^2 .

It is a cyclic number.

It is not a de Polignac number, because 6493616813 - 2¹⁰ = 6493615789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6493616413) 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, 763520 + ... + 771977.

It is an arithmetic number, because the mean of its divisors is an integer number (1623789135).

Almost surely, 2^6493616813 is an apocalyptic number.

It is an amenable number.

6493616813 is a deficient number, since it is larger than the sum of its proper divisors (1539727).

6493616813 is a wasteful number, since it uses less digits than its factorization.

6493616813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539726.

The product of its digits is 559872, while the sum is 47.

The square root of 6493616813 is about 80582.9809140863. The cubic root of 6493616813 is about 1865.6444727676.

The spelling of 6493616813 in words is "six billion, four hundred ninety-three million, six hundred sixteen thousand, eight hundred thirteen".