165989259120 has 160 divisors (see below), whose sum is σ = 517945420800. Its totient is φ = 43973867520.

The previous prime is 165989259103. The next prime is 165989259187. The reversal of 165989259120 is 21952989561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36343077 + ... + 36347643.

It is an arithmetic number, because the mean of its divisors is an integer number (3237158880).

Almost surely, 2^165989259120 is an apocalyptic number.

165989259120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165989259120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258972710400).

165989259120 is an abundant number, since it is smaller than the sum of its proper divisors (351956161680).

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

165989259120 is a wasteful number, since it uses less digits than its factorization.

165989259120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5543 (or 5537 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 57.

The spelling of 165989259120 in words is "one hundred sixty-five billion, nine hundred eighty-nine million, two hundred fifty-nine thousand, one hundred twenty".