165785320112 has 40 divisors (see below), whose sum is σ = 331921708032. Its totient is φ = 80133768000.

The previous prime is 165785320111. The next prime is 165785320117. The reversal of 165785320112 is 211023587561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 165785320112.

It is not an unprimeable number, because it can be changed into a prime (165785320111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293237 + ... + 646187.

Almost surely, 2^165785320112 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 165785320112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165960854016).

165785320112 is an abundant number, since it is smaller than the sum of its proper divisors (166136387920).

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

165785320112 is a wasteful number, since it uses less digits than its factorization.

165785320112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353937 (or 353931 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 165785320112 in words is "one hundred sixty-five billion, seven hundred eighty-five million, three hundred twenty thousand, one hundred twelve".