165545280 has 168 divisors, whose sum is σ = 581997312. Its totient is φ = 43170816.

The previous prime is 165545279. The next prime is 165545287. The reversal of 165545280 is 82545561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165545287) 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, 134749 + ... + 135971.

Almost surely, 2^165545280 is an apocalyptic number.

165545280 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 165545280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290998656).

165545280 is an abundant number, since it is smaller than the sum of its proper divisors (416452032).

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

165545280 is a wasteful number, since it uses less digits than its factorization.

165545280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 165545280 is about 12866.4400670893. The cubic root of 165545280 is about 549.0841838915.

The spelling of 165545280 in words is "one hundred sixty-five million, five hundred forty-five thousand, two hundred eighty".