165170720 has 96 divisors (see below), whose sum is σ = 458498880. Its totient is φ = 55434240.

The previous prime is 165170699. The next prime is 165170771. The reversal of 165170720 is 27071561.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19271 + ... + 26489.

It is an arithmetic number, because the mean of its divisors is an integer number (4776030).

Almost surely, 2^165170720 is an apocalyptic number.

165170720 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 165170720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229249440).

165170720 is an abundant number, since it is smaller than the sum of its proper divisors (293328160).

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

165170720 is a wasteful number, since it uses less digits than its factorization.

165170720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258 (or 7250 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 165170720 is about 12851.8761276321. The cubic root of 165170720 is about 548.6697549236.

The spelling of 165170720 in words is "one hundred sixty-five million, one hundred seventy thousand, seven hundred twenty".