165691944 has 96 divisors (see below), whose sum is σ = 493590240. Its totient is φ = 49795200.

The previous prime is 165691907. The next prime is 165692011. The reversal of 165691944 is 449196561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 165691944.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102954 + ... + 104550.

It is an arithmetic number, because the mean of its divisors is an integer number (5141565).

Almost surely, 2^165691944 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 165691944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246795120).

165691944 is an abundant number, since it is smaller than the sum of its proper divisors (327898296).

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

165691944 is a wasteful number, since it uses less digits than its factorization.

165691944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1744 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 165691944 is about 12872.1382839061. The cubic root of 165691944 is about 549.2462888102.

The spelling of 165691944 in words is "one hundred sixty-five million, six hundred ninety-one thousand, nine hundred forty-four".