6561356241 has 32 divisors (see below), whose sum is σ = 10067028480. Its totient is φ = 3759436800.

The previous prime is 6561356213. The next prime is 6561356251. The reversal of 6561356241 is 1426531656.

It is not a de Polignac number, because 6561356241 - 2⁵ = 6561356209 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6561356241.

It is not an unprimeable number, because it can be changed into a prime (6561356201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297201 + ... + 318513.

It is an arithmetic number, because the mean of its divisors is an integer number (314594640).

Almost surely, 2^6561356241 is an apocalyptic number.

It is an amenable number.

6561356241 is a deficient number, since it is larger than the sum of its proper divisors (3505672239).

6561356241 is a wasteful number, since it uses less digits than its factorization.

6561356241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21837.

The product of its digits is 129600, while the sum is 39.

The square root of 6561356241 is about 81002.1989886694. The cubic root of 6561356241 is about 1872.1093226731.

Adding to 6561356241 its reverse (1426531656), we get a palindrome (7987887897).

The spelling of 6561356241 in words is "six billion, five hundred sixty-one million, three hundred fifty-six thousand, two hundred forty-one".