165166533 has 20 divisors (see below), whose sum is σ = 281978400. Its totient is φ = 94380552.

The previous prime is 165166517. The next prime is 165166541. The reversal of 165166533 is 335661561.

165166533 is a `hidden beast` number, since 1 + 65 + 1 + 66 + 533 = 666.

It is not a de Polignac number, because 165166533 - 2⁴ = 165166517 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 (165166553) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 145083 + ... + 146216.

It is an arithmetic number, because the mean of its divisors is an integer number (14098920).

Almost surely, 2^165166533 is an apocalyptic number.

It is an amenable number.

165166533 is a deficient number, since it is larger than the sum of its proper divisors (116811867).

165166533 is an equidigital number, since it uses as much as digits as its factorization.

165166533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291318 (or 291309 counting only the distinct ones).

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

The square root of 165166533 is about 12851.7132320948. The cubic root of 165166533 is about 548.6651187111.

The spelling of 165166533 in words is "one hundred sixty-five million, one hundred sixty-six thousand, five hundred thirty-three".