6561200211541 has 2 divisors, whose sum is σ = 6561200211542. Its totient is φ = 6561200211540.

The previous prime is 6561200211497. The next prime is 6561200211583. The reversal of 6561200211541 is 1451120021656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6483287212900 + 77912998641 = 2546230^2 + 279129^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561200211541 - 2¹¹ = 6561200209493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6561200211497 and 6561200211506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561200211341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280600105770 + 3280600105771.

It is an arithmetic number, because the mean of its divisors is an integer number (3280600105771).

Almost surely, 2^{6561200211541} is an apocalyptic number.

It is an amenable number.

6561200211541 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561200211541 is an equidigital number, since it uses as much as digits as its factorization.

6561200211541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 6561200211541 in words is "six trillion, five hundred sixty-one billion, two hundred million, two hundred eleven thousand, five hundred forty-one".