6500005643 has 16 divisors (see below), whose sum is σ = 7031840256. Its totient is φ = 5992599360.

The previous prime is 6500005637. The next prime is 6500005661. The reversal of 6500005643 is 3465000056.

It is not a de Polignac number, because 6500005643 - 2⁶ = 6500005579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6500005663) 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, 36746 + ... + 119792.

It is an arithmetic number, because the mean of its divisors is an integer number (439490016).

Almost surely, 2^6500005643 is an apocalyptic number.

6500005643 is a deficient number, since it is larger than the sum of its proper divisors (531834613).

6500005643 is a wasteful number, since it uses less digits than its factorization.

6500005643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83194.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 6500005643 is about 80622.6124793783. The cubic root of 6500005643 is about 1866.2561184741.

Adding to 6500005643 its reverse (3465000056), we get a palindrome (9965005699).

The spelling of 6500005643 in words is "six billion, five hundred million, five thousand, six hundred forty-three".