165665011 has 2 divisors, whose sum is σ = 165665012. Its totient is φ = 165665010.

The previous prime is 165664999. The next prime is 165665053. The reversal of 165665011 is 110566561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165665011 - 2¹⁷ = 165533939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165665611) 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, 82832505 + 82832506.

It is an arithmetic number, because the mean of its divisors is an integer number (82832506).

Almost surely, 2^165665011 is an apocalyptic number.

165665011 is a deficient number, since it is larger than the sum of its proper divisors (1).

165665011 is an equidigital number, since it uses as much as digits as its factorization.

165665011 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 31.

The square root of 165665011 is about 12871.0920671091. The cubic root of 165665011 is about 549.2165274520.

The spelling of 165665011 in words is "one hundred sixty-five million, six hundred sixty-five thousand, eleven".