11566662061121 has 2 divisors, whose sum is σ = 11566662061122. Its totient is φ = 11566662061120.

The previous prime is 11566662061111. The next prime is 11566662061159. The reversal of 11566662061121 is 12116026666511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11566535723521 + 126337600 = 3400961^2 + 11240^2 .

It is a cyclic number.

It is not a de Polignac number, because 11566662061121 - 2¹⁴ = 11566662044737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11566662061111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783331030560 + 5783331030561.

It is an arithmetic number, because the mean of its divisors is an integer number (5783331030561).

Almost surely, 2^{11566662061121} is an apocalyptic number.

It is an amenable number.

11566662061121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566662061121 is an equidigital number, since it uses as much as digits as its factorization.

11566662061121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 11566662061121 in words is "eleven trillion, five hundred sixty-six billion, six hundred sixty-two million, sixty-one thousand, one hundred twenty-one".