165510161 has 2 divisors, whose sum is σ = 165510162. Its totient is φ = 165510160.

The previous prime is 165510143. The next prime is 165510173. The reversal of 165510161 is 161015561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165508225 + 1936 = 12865^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 165510161 - 2⁶ = 165510097 is a prime.

It is a super-2 number, since 2×165510161² = 54787226788491842, which contains 22 as substring.

It is a Sophie Germain 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 165510161.

It is not a weakly prime, because it can be changed into another prime (165510101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82755080 + 82755081.

It is an arithmetic number, because the mean of its divisors is an integer number (82755081).

Almost surely, 2^165510161 is an apocalyptic number.

It is an amenable number.

165510161 is a deficient number, since it is larger than the sum of its proper divisors (1).

165510161 is an equidigital number, since it uses as much as digits as its factorization.

165510161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 165510161 is about 12865.0752426871. The cubic root of 165510161 is about 549.0453533246.

The spelling of 165510161 in words is "one hundred sixty-five million, five hundred ten thousand, one hundred sixty-one".