165789860165 has 4 divisors (see below), whose sum is σ = 198947832204. Its totient is φ = 132631888128.

The previous prime is 165789860161. The next prime is 165789860167. The reversal of 165789860165 is 561068987561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561068987561 = 23 ⋅24394303807.

It can be written as a sum of positive squares in 2 ways, for example, as 42909465316 + 122880394849 = 207146^2 + 350543^2 .

It is a cyclic number.

It is not a de Polignac number, because 165789860165 - 2² = 165789860161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165789860098 and 165789860107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165789860161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16578986012 + ... + 16578986021.

It is an arithmetic number, because the mean of its divisors is an integer number (49736958051).

Almost surely, 2^165789860165 is an apocalyptic number.

It is an amenable number.

165789860165 is a deficient number, since it is larger than the sum of its proper divisors (33157972039).

165789860165 is an equidigital number, since it uses as much as digits as its factorization.

165789860165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33157972038.

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 165789860165 in words is "one hundred sixty-five billion, seven hundred eighty-nine million, eight hundred sixty thousand, one hundred sixty-five".