10561056550991 has 2 divisors, whose sum is σ = 10561056550992. Its totient is φ = 10561056550990.

The previous prime is 10561056550909. The next prime is 10561056551063. The reversal of 10561056550991 is 19905565016501.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10561056550991 - 2³⁸ = 10286178644047 is a prime.

It is a super-2 number, since 2×10561056550991² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10561056555991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280528275495 + 5280528275496.

It is an arithmetic number, because the mean of its divisors is an integer number (5280528275496).

Almost surely, 2^{10561056550991} is an apocalyptic number.

10561056550991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10561056550991 is an equidigital number, since it uses as much as digits as its factorization.

10561056550991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1822500, while the sum is 53.

The spelling of 10561056550991 in words is "ten trillion, five hundred sixty-one billion, fifty-six million, five hundred fifty thousand, nine hundred ninety-one".