165500000 has 84 divisors (see below), whose sum is σ = 408510396. Its totient is φ = 66000000.

The previous prime is 165499993. The next prime is 165500011. The reversal of 165500000 is 5561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 499835 + ... + 500165.

It is an arithmetic number, because the mean of its divisors is an integer number (4863219).

Almost surely, 2^165500000 is an apocalyptic number.

165500000 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 165500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204255198).

165500000 is an abundant number, since it is smaller than the sum of its proper divisors (243010396).

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

165500000 is an frugal number, since it uses more digits than its factorization.

165500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 165500000 is about 12864.6803302686. The cubic root of 165500000 is about 549.0341174303.

Adding to 165500000 its reverse (5561), we get a palindrome (165505561).

The spelling of 165500000 in words is "one hundred sixty-five million, five hundred thousand".