165530500 has 48 divisors (see below), whose sum is σ = 365352624. Its totient is φ = 65510400.

The previous prime is 165530467. The next prime is 165530509. The reversal of 165530500 is 5035561.

It can be written as a sum of positive squares in 8 ways, for example, as 20376196 + 145154304 = 4514^2 + 12048^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (165530509) 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, 46794 + ... + 50206.

It is an arithmetic number, because the mean of its divisors is an integer number (7611513).

Almost surely, 2^165530500 is an apocalyptic number.

165530500 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 165530500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182676312).

165530500 is an abundant number, since it is smaller than the sum of its proper divisors (199822124).

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

165530500 is a wasteful number, since it uses less digits than its factorization.

165530500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529 (or 3517 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 165530500 is about 12865.8656918219. The cubic root of 165530500 is about 549.0678425300.

The spelling of 165530500 in words is "one hundred sixty-five million, five hundred thirty thousand, five hundred".