165170220 has 96 divisors (see below), whose sum is σ = 485388288. Its totient is φ = 41916672.

The previous prime is 165170197. The next prime is 165170221. The reversal of 165170220 is 22071561.

It is not an unprimeable number, because it can be changed into a prime (165170221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103549 + ... + 105131.

It is an arithmetic number, because the mean of its divisors is an integer number (5056128).

Almost surely, 2^165170220 is an apocalyptic number.

165170220 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 165170220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242694144).

165170220 is an abundant number, since it is smaller than the sum of its proper divisors (320218068).

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

165170220 is a wasteful number, since it uses less digits than its factorization.

165170220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 165170220 is about 12851.8566752046. The cubic root of 165170220 is about 548.6692012840.

The spelling of 165170220 in words is "one hundred sixty-five million, one hundred seventy thousand, two hundred twenty".