165665133 has 24 divisors (see below), whose sum is σ = 248277120. Its totient is φ = 106367040.

The previous prime is 165665131. The next prime is 165665167. The reversal of 165665133 is 331566561.

165665133 is a `hidden beast` number, since 16 + 566 + 51 + 33 = 666.

It is not a de Polignac number, because 165665133 - 2¹ = 165665131 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165665131) 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 23 ways as a sum of consecutive naturals, for example, 26310 + ... + 31992.

It is an arithmetic number, because the mean of its divisors is an integer number (10344880).

Almost surely, 2^165665133 is an apocalyptic number.

It is an amenable number.

165665133 is a deficient number, since it is larger than the sum of its proper divisors (82611987).

165665133 is a wasteful number, since it uses less digits than its factorization.

165665133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809 (or 5806 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 165665133 is about 12871.0968064109. The cubic root of 165665133 is about 549.2166622710.

The spelling of 165665133 in words is "one hundred sixty-five million, six hundred sixty-five thousand, one hundred thirty-three".