165783511328 has 48 divisors (see below), whose sum is σ = 335410691616. Its totient is φ = 80616399360.

The previous prime is 165783511321. The next prime is 165783511331. The reversal of 165783511328 is 823115387561.

It is a super-2 number, since 2×165783511328² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165783511321) 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 7 ways as a sum of consecutive naturals, for example, 62063 + ... + 579153.

It is an arithmetic number, because the mean of its divisors is an integer number (6987722742).

Almost surely, 2^165783511328 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 165783511328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167705345808).

165783511328 is an abundant number, since it is smaller than the sum of its proper divisors (169627180288).

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

165783511328 is a wasteful number, since it uses less digits than its factorization.

165783511328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517377 (or 517369 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 50.

Adding to 165783511328 its reverse (823115387561), we get a palindrome (988898898889).

The spelling of 165783511328 in words is "one hundred sixty-five billion, seven hundred eighty-three million, five hundred eleven thousand, three hundred twenty-eight".