165500840304 has 80 divisors (see below), whose sum is σ = 490372899840. Its totient is φ = 53387363520.

The previous prime is 165500840303. The next prime is 165500840357. The reversal of 165500840304 is 403048005561.

It is a happy number.

It is a super-2 number, since 2×165500840304² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165500840303) 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 15 ways as a sum of consecutive naturals, for example, 6165702 + ... + 6192485.

It is an arithmetic number, because the mean of its divisors is an integer number (6129661248).

Almost surely, 2^165500840304 is an apocalyptic number.

It is an amenable number.

165500840304 is an abundant number, since it is smaller than the sum of its proper divisors (324872059536).

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

165500840304 is a wasteful number, since it uses less digits than its factorization.

165500840304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12358235 (or 12358223 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 165500840304 its reverse (403048005561), we get a palindrome (568548845865).

The spelling of 165500840304 in words is "one hundred sixty-five billion, five hundred million, eight hundred forty thousand, three hundred four".