16605161 has 2 divisors, whose sum is σ = 16605162. Its totient is φ = 16605160.

The previous prime is 16605143. The next prime is 16605163. The reversal of 16605161 is 16150661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16556761 + 48400 = 4069^2 + 220^2 .

It is an emirp because it is prime and its reverse (16150661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16605161 - 2¹⁸ = 16343017 is a prime.

It is a Sophie Germain prime.

Together with 16605163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16605161.

It is not a weakly prime, because it can be changed into another prime (16605163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302580 + 8302581.

It is an arithmetic number, because the mean of its divisors is an integer number (8302581).

Almost surely, 2^16605161 is an apocalyptic number.

It is an amenable number.

16605161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16605161 is an equidigital number, since it uses as much as digits as its factorization.

16605161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 16605161 is about 4074.9430670870. The cubic root of 16605161 is about 255.1218743323.

The spelling of 16605161 in words is "sixteen million, six hundred five thousand, one hundred sixty-one".