165864216 has 48 divisors (see below), whose sum is σ = 482363640. Its totient is φ = 47389440.

The previous prime is 165864211. The next prime is 165864217. The reversal of 165864216 is 612468561.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165864211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69345 + ... + 71696.

Almost surely, 2^165864216 is an apocalyptic number.

It is an amenable number.

165864216 is an abundant number, since it is smaller than the sum of its proper divisors (316499424).

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

165864216 is a wasteful number, since it uses less digits than its factorization.

165864216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141064 (or 141053 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 165864216 is about 12878.8282075661. The cubic root of 165864216 is about 549.4365756378.

It can be divided in two parts, 16586 and 4216, that added together give a palindrome (20802).

The spelling of 165864216 in words is "one hundred sixty-five million, eight hundred sixty-four thousand, two hundred sixteen".