165843018 has 128 divisors (see below), whose sum is σ = 428544000. Its totient is φ = 47044800.

The previous prime is 165843017. The next prime is 165843043. The reversal of 165843018 is 810348561.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165843017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 833283 + ... + 833481.

It is an arithmetic number, because the mean of its divisors is an integer number (3348000).

Almost surely, 2^165843018 is an apocalyptic number.

165843018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165843018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214272000).

165843018 is an abundant number, since it is smaller than the sum of its proper divisors (262700982).

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

165843018 is a wasteful number, since it uses less digits than its factorization.

165843018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 165843018 is about 12878.0052026702. The cubic root of 165843018 is about 549.4131680316.

The spelling of 165843018 in words is "one hundred sixty-five million, eight hundred forty-three thousand, eighteen".