165183973 has 4 divisors (see below), whose sum is σ = 165323628. Its totient is φ = 165044320.

The previous prime is 165183959. The next prime is 165183979. The reversal of 165183973 is 379381561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70257924 + 94926049 = 8382^2 + 9743^2 .

It is a cyclic number.

It is not a de Polignac number, because 165183973 - 2⁹ = 165183461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165183979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68038 + ... + 70423.

It is an arithmetic number, because the mean of its divisors is an integer number (41330907).

Almost surely, 2^165183973 is an apocalyptic number.

It is an amenable number.

165183973 is a deficient number, since it is larger than the sum of its proper divisors (139655).

165183973 is a wasteful number, since it uses less digits than its factorization.

165183973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139654.

The product of its digits is 136080, while the sum is 43.

The square root of 165183973 is about 12852.3917229440. The cubic root of 165183973 is about 548.6844292876.

The spelling of 165183973 in words is "one hundred sixty-five million, one hundred eighty-three thousand, nine hundred seventy-three".