165680033 has 4 divisors (see below), whose sum is σ = 165720768. Its totient is φ = 165639300.

The previous prime is 165679957. The next prime is 165680041. The reversal of 165680033 is 330086561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165680033 - 2¹⁰ = 165679009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165680233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13493 + ... + 22658.

It is an arithmetic number, because the mean of its divisors is an integer number (41430192).

Almost surely, 2^165680033 is an apocalyptic number.

It is an amenable number.

165680033 is a deficient number, since it is larger than the sum of its proper divisors (40735).

165680033 is an equidigital number, since it uses as much as digits as its factorization.

165680033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40734.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 165680033 is about 12871.6756096477. The cubic root of 165680033 is about 549.2331273791.

The spelling of 165680033 in words is "one hundred sixty-five million, six hundred eighty thousand, thirty-three".