165220536 has 64 divisors (see below), whose sum is σ = 447541920. Its totient is φ = 50526720.

The previous prime is 165220507. The next prime is 165220537. The reversal of 165220536 is 635022561.

165220536 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×165220536² = 54595651032254592, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165220537) 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, 52446 + ... + 55506.

Almost surely, 2^165220536 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 165220536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223770960).

165220536 is an abundant number, since it is smaller than the sum of its proper divisors (282321384).

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

165220536 is a wasteful number, since it uses less digits than its factorization.

165220536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256 (or 3252 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 165220536 is about 12853.8140643157. The cubic root of 165220536 is about 548.7249095441.

The spelling of 165220536 in words is "one hundred sixty-five million, two hundred twenty thousand, five hundred thirty-six".