165939760 has 80 divisors (see below), whose sum is σ = 443025216. Its totient is φ = 56623104.

The previous prime is 165939727. The next prime is 165939791. The reversal of 165939760 is 67939561.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 165939760.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143344 + ... + 144496.

Almost surely, 2^165939760 is an apocalyptic number.

165939760 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 165939760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221512608).

165939760 is an abundant number, since it is smaller than the sum of its proper divisors (277085456).

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

165939760 is a wasteful number, since it uses less digits than its factorization.

165939760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430 (or 1424 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 165939760 is about 12881.7607492144. The cubic root of 165939760 is about 549.5199778684.

The spelling of 165939760 in words is "one hundred sixty-five million, nine hundred thirty-nine thousand, seven hundred sixty".