165844167873 has 4 divisors (see below), whose sum is σ = 221125557168. Its totient is φ = 110562778580.

The previous prime is 165844167869. The next prime is 165844167917. The reversal of 165844167873 is 378761448561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 378761448561 = 3 ⋅126253816187.

It is a cyclic number.

It is not a de Polignac number, because 165844167873 - 2² = 165844167869 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165844167373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27640694643 + ... + 27640694648.

It is an arithmetic number, because the mean of its divisors is an integer number (55281389292).

Almost surely, 2^165844167873 is an apocalyptic number.

It is an amenable number.

165844167873 is a deficient number, since it is larger than the sum of its proper divisors (55281389295).

165844167873 is an equidigital number, since it uses as much as digits as its factorization.

165844167873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55281389294.

The product of its digits is 27095040, while the sum is 60.

The spelling of 165844167873 in words is "one hundred sixty-five billion, eight hundred forty-four million, one hundred sixty-seven thousand, eight hundred seventy-three".