165238864 has 40 divisors (see below), whose sum is σ = 367476480. Its totient is φ = 70508928.

The previous prime is 165238837. The next prime is 165238907. The reversal of 165238864 is 468832561.

165238864 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-3 number, since 3×165238864³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165238864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23682 + ... + 29854.

It is an arithmetic number, because the mean of its divisors is an integer number (9186912).

Almost surely, 2^165238864 is an apocalyptic number.

165238864 is a gapful number since it is divisible by the number (14) 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 165238864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183738240).

165238864 is an abundant number, since it is smaller than the sum of its proper divisors (202237616).

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

165238864 is a wasteful number, since it uses less digits than its factorization.

165238864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6427 (or 6421 counting only the distinct ones).

The product of its digits is 276480, while the sum is 43.

The square root of 165238864 is about 12854.5269846852. The cubic root of 165238864 is about 548.7451989071.

The spelling of 165238864 in words is "one hundred sixty-five million, two hundred thirty-eight thousand, eight hundred sixty-four".