165017280 has 224 divisors, whose sum is σ = 563270400. Its totient is φ = 40808448.

The previous prime is 165017257. The next prime is 165017339. The reversal of 165017280 is 82710561.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1513866 + ... + 1513974.

It is an arithmetic number, because the mean of its divisors is an integer number (2514600).

Almost surely, 2^165017280 is an apocalyptic number.

165017280 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 165017280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281635200).

165017280 is an abundant number, since it is smaller than the sum of its proper divisors (398253120).

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

165017280 is a wasteful number, since it uses less digits than its factorization.

165017280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 165017280 is about 12845.9051841433. The cubic root of 165017280 is about 548.4998015360.

The spelling of 165017280 in words is "one hundred sixty-five million, seventeen thousand, two hundred eighty".