16563465161 has 2 divisors, whose sum is σ = 16563465162. Its totient is φ = 16563465160.

The previous prime is 16563465119. The next prime is 16563465169. The reversal of 16563465161 is 16156436561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14932840000 + 1630625161 = 122200^2 + 40381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16563465161 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 (16563465169) 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, 8281732580 + 8281732581.

It is an arithmetic number, because the mean of its divisors is an integer number (8281732581).

Almost surely, 2^16563465161 is an apocalyptic number.

It is an amenable number.

16563465161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16563465161 is an equidigital number, since it uses as much as digits as its factorization.

16563465161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 44.

The spelling of 16563465161 in words is "sixteen billion, five hundred sixty-three million, four hundred sixty-five thousand, one hundred sixty-one".