165740880 has 80 divisors (see below), whose sum is σ = 530394624. Its totient is φ = 42769920.

The previous prime is 165740867. The next prime is 165740881. The reversal of 165740880 is 88047561.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165740881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3699 + ... + 18578.

Almost surely, 2^165740880 is an apocalyptic number.

165740880 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 165740880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265197312).

165740880 is an abundant number, since it is smaller than the sum of its proper divisors (364653744).

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

165740880 is a wasteful number, since it uses less digits than its factorization.

165740880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22324 (or 22318 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 165740880 is about 12874.0389932608. The cubic root of 165740880 is about 549.3003555522.

The spelling of 165740880 in words is "one hundred sixty-five million, seven hundred forty thousand, eight hundred eighty".