6561605010511 has 2 divisors, whose sum is σ = 6561605010512. Its totient is φ = 6561605010510.

The previous prime is 6561605010479. The next prime is 6561605010517. The reversal of 6561605010511 is 1150105061656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6561605010511 - 2⁵ = 6561605010479 is a prime.

It is a super-2 number, since 2×6561605010511² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561605010517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280802505255 + 3280802505256.

It is an arithmetic number, because the mean of its divisors is an integer number (3280802505256).

Almost surely, 2^{6561605010511} is an apocalyptic number.

6561605010511 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561605010511 is an equidigital number, since it uses as much as digits as its factorization.

6561605010511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 6561605010511 in words is "six trillion, five hundred sixty-one billion, six hundred five million, ten thousand, five hundred eleven".