6561768944011 has 2 divisors, whose sum is σ = 6561768944012. Its totient is φ = 6561768944010.

The previous prime is 6561768943997. The next prime is 6561768944053. The reversal of 6561768944011 is 1104498671656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6561768944011 - 2⁴¹ = 4362745688459 is a prime.

It is not a weakly prime, because it can be changed into another prime (6561768944611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280884472005 + 3280884472006.

It is an arithmetic number, because the mean of its divisors is an integer number (3280884472006).

Almost surely, 2^{6561768944011} is an apocalyptic number.

6561768944011 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561768944011 is an equidigital number, since it uses as much as digits as its factorization.

6561768944011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 6561768944011 in words is "six trillion, five hundred sixty-one billion, seven hundred sixty-eight million, nine hundred forty-four thousand, eleven".