165970818 has 48 divisors (see below), whose sum is σ = 395531136. Its totient is φ = 49978080.

The previous prime is 165970817. The next prime is 165970873. The reversal of 165970818 is 818079561.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165970811) 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 23 ways as a sum of consecutive naturals, for example, 3453 + ... + 18543.

It is an arithmetic number, because the mean of its divisors is an integer number (8240232).

Almost surely, 2^165970818 is an apocalyptic number.

165970818 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 165970818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197765568).

165970818 is an abundant number, since it is smaller than the sum of its proper divisors (229560318).

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

165970818 is a wasteful number, since it uses less digits than its factorization.

165970818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15159 (or 15156 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 165970818 is about 12882.9661957175. The cubic root of 165970818 is about 549.5542592381.

The spelling of 165970818 in words is "one hundred sixty-five million, nine hundred seventy thousand, eight hundred eighteen".