165804159 has 4 divisors (see below), whose sum is σ = 221072216. Its totient is φ = 110536104.

The previous prime is 165804157. The next prime is 165804169. The reversal of 165804159 is 951408561.

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

It is not a de Polignac number, because 165804159 - 2¹ = 165804157 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 (165804157) 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, 27634024 + ... + 27634029.

It is an arithmetic number, because the mean of its divisors is an integer number (55268054).

Almost surely, 2^165804159 is an apocalyptic number.

165804159 is a deficient number, since it is larger than the sum of its proper divisors (55268057).

165804159 is an equidigital number, since it uses as much as digits as its factorization.

165804159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55268056.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 165804159 is about 12876.4963790621. The cubic root of 165804159 is about 549.3702533237.

The spelling of 165804159 in words is "one hundred sixty-five million, eight hundred four thousand, one hundred fifty-nine".