165321204304 has 160 divisors (see below), whose sum is σ = 360399790080. Its totient is φ = 73090169856.

The previous prime is 165321204259. The next prime is 165321204329. The reversal of 165321204304 is 403402123561.

165321204304 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×165321204304² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160039372 + ... + 160040404.

It is an arithmetic number, because the mean of its divisors is an integer number (2252498688).

Almost surely, 2^165321204304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165321204304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180199895040).

165321204304 is an abundant number, since it is smaller than the sum of its proper divisors (195078585776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165321204304 is a wasteful number, since it uses less digits than its factorization.

165321204304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617 (or 1611 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 165321204304 its reverse (403402123561), we get a palindrome (568723327865).

The spelling of 165321204304 in words is "one hundred sixty-five billion, three hundred twenty-one million, two hundred four thousand, three hundred four".