161005566011 has 2 divisors, whose sum is σ = 161005566012. Its totient is φ = 161005566010.

The previous prime is 161005565993. The next prime is 161005566013. The reversal of 161005566011 is 110665500161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161005566011 - 2⁶ = 161005565947 is a prime.

Together with 161005566013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161005566013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80502783005 + 80502783006.

It is an arithmetic number, because the mean of its divisors is an integer number (80502783006).

Almost surely, 2^161005566011 is an apocalyptic number.

161005566011 is a deficient number, since it is larger than the sum of its proper divisors (1).

161005566011 is an equidigital number, since it uses as much as digits as its factorization.

161005566011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 161005566011 in words is "one hundred sixty-one billion, five million, five hundred sixty-six thousand, eleven".