165353720 has 64 divisors (see below), whose sum is σ = 427921920. Its totient is φ = 56329344.

The previous prime is 165353719. The next prime is 165353729. The reversal of 165353720 is 27353561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165353729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43829 + ... + 47451.

It is an arithmetic number, because the mean of its divisors is an integer number (6686280).

Almost surely, 2^165353720 is an apocalyptic number.

165353720 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 165353720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213960960).

165353720 is an abundant number, since it is smaller than the sum of its proper divisors (262568200).

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

165353720 is a wasteful number, since it uses less digits than its factorization.

165353720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804 (or 3800 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 165353720 is about 12858.9937397916. The cubic root of 165353720 is about 548.8723120240.

The spelling of 165353720 in words is "one hundred sixty-five million, three hundred fifty-three thousand, seven hundred twenty".