6561116333 has 2 divisors, whose sum is σ = 6561116334. Its totient is φ = 6561116332.

The previous prime is 6561116297. The next prime is 6561116351. The reversal of 6561116333 is 3336111656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4842350569 + 1718765764 = 69587^2 + 41458^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561116333 - 2⁶ = 6561116269 is a prime.

It is a super-3 number, since 3×6561116333³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6561116293 and 6561116302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561106333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280558166 + 3280558167.

It is an arithmetic number, because the mean of its divisors is an integer number (3280558167).

Almost surely, 2^6561116333 is an apocalyptic number.

It is an amenable number.

6561116333 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561116333 is an equidigital number, since it uses as much as digits as its factorization.

6561116333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 35.

The square root of 6561116333 is about 81000.7181017551. The cubic root of 6561116333 is about 1872.0865052625.

Adding to 6561116333 its reverse (3336111656), we get a palindrome (9897227989).

The spelling of 6561116333 in words is "six billion, five hundred sixty-one million, one hundred sixteen thousand, three hundred thirty-three".