165535161 has 16 divisors (see below), whose sum is σ = 249082560. Its totient is φ = 96864320.

The previous prime is 165535159. The next prime is 165535177. The reversal of 165535161 is 161535561.

It is a cyclic number.

It is not a de Polignac number, because 165535161 - 2¹ = 165535159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (165535121) 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 in 15 ways as a sum of consecutive naturals, for example, 85530 + ... + 87443.

It is an arithmetic number, because the mean of its divisors is an integer number (15567660).

Almost surely, 2^165535161 is an apocalyptic number.

165535161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165535161 is a deficient number, since it is larger than the sum of its proper divisors (83547399).

165535161 is a wasteful number, since it uses less digits than its factorization.

165535161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173016.

The product of its digits is 13500, while the sum is 33.

The square root of 165535161 is about 12866.0468287660. The cubic root of 165535161 is about 549.0729960238.

The spelling of 165535161 in words is "one hundred sixty-five million, five hundred thirty-five thousand, one hundred sixty-one".