165943280 has 40 divisors (see below), whose sum is σ = 388879872. Its totient is φ = 65850624.

The previous prime is 165943243. The next prime is 165943301. The reversal of 165943280 is 82349561.

It is a happy number.

165943280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

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, 1994 + ... + 18326.

Almost surely, 2^165943280 is an apocalyptic number.

165943280 is a gapful number since it is divisible by the number (10) 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 165943280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194439936).

165943280 is an abundant number, since it is smaller than the sum of its proper divisors (222936592).

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

165943280 is a wasteful number, since it uses less digits than its factorization.

165943280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16473 (or 16467 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 165943280 is about 12881.8973757750. The cubic root of 165943280 is about 549.5238634082.

The spelling of 165943280 in words is "one hundred sixty-five million, nine hundred forty-three thousand, two hundred eighty".