165605280 has 48 divisors (see below), whose sum is σ = 521658144. Its totient is φ = 44161280.

The previous prime is 165605269. The next prime is 165605339. The reversal of 165605280 is 82506561.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172026 + ... + 172985.

It is an arithmetic number, because the mean of its divisors is an integer number (10867878).

Almost surely, 2^165605280 is an apocalyptic number.

165605280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165605280 is an abundant number, since it is smaller than the sum of its proper divisors (356052864).

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

165605280 is a wasteful number, since it uses less digits than its factorization.

165605280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345029 (or 345021 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 165605280 is about 12868.7715031389. The cubic root of 165605280 is about 549.1505123136.

The spelling of 165605280 in words is "one hundred sixty-five million, six hundred five thousand, two hundred eighty".