6581632321 has 24 divisors (see below), whose sum is σ = 7557076800. Its totient is φ = 5683999200.

The previous prime is 6581632283. The next prime is 6581632327. The reversal of 6581632321 is 1232361856.

6581632321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-6581632321 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6581632327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 863236 + ... + 870826.

It is an arithmetic number, because the mean of its divisors is an integer number (314878200).

Almost surely, 2^6581632321 is an apocalyptic number.

It is an amenable number.

6581632321 is a deficient number, since it is larger than the sum of its proper divisors (975444479).

6581632321 is a wasteful number, since it uses less digits than its factorization.

6581632321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7797 (or 7774 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 6581632321 is about 81127.2600363158. The cubic root of 6581632321 is about 1874.0357539022.

The spelling of 6581632321 in words is "six billion, five hundred eighty-one million, six hundred thirty-two thousand, three hundred twenty-one".