6561116323 has 16 divisors (see below), whose sum is σ = 7009247520. Its totient is φ = 6120142336.

The previous prime is 6561116297. The next prime is 6561116333. The reversal of 6561116323 is 3236111656.

It is a cyclic number.

It is not a de Polignac number, because 6561116323 - 2²¹ = 6559019171 is a prime.

It is a super-3 number, since 3×6561116323³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561116333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 897240 + ... + 904522.

It is an arithmetic number, because the mean of its divisors is an integer number (438077970).

Almost surely, 2^6561116323 is an apocalyptic number.

6561116323 is a deficient number, since it is larger than the sum of its proper divisors (448131197).

6561116323 is a wasteful number, since it uses less digits than its factorization.

6561116323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7766.

The product of its digits is 19440, while the sum is 34.

The square root of 6561116323 is about 81000.7180400273. The cubic root of 6561116323 is about 1872.0865043114.

Adding to 6561116323 its reverse (3236111656), we get a palindrome (9797227979).

The spelling of 6561116323 in words is "six billion, five hundred sixty-one million, one hundred sixteen thousand, three hundred twenty-three".