165220000 has 120 divisors (see below), whose sum is σ = 444007872. Its totient is φ = 60000000.

The previous prime is 165219973. The next prime is 165220007. The reversal of 165220000 is 22561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (165220007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 219625 + ... + 220375.

Almost surely, 2^165220000 is an apocalyptic number.

165220000 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 165220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222003936).

165220000 is an abundant number, since it is smaller than the sum of its proper divisors (278787872).

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

165220000 is an equidigital number, since it uses as much as digits as its factorization.

165220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 165220000 is about 12853.7932144562. The cubic root of 165220000 is about 548.7243161617.

Adding to 165220000 its reverse (22561), we get a palindrome (165242561).

The spelling of 165220000 in words is "one hundred sixty-five million, two hundred twenty thousand".