65500 has 24 divisors (see below), whose sum is σ = 144144. Its totient is φ = 26000.

The previous prime is 65497. The next prime is 65519. The reversal of 65500 is 556.

It is a happy number.

It is a nialpdrome in base 10 and base 16.

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 7 ways as a sum of consecutive naturals, for example, 435 + ... + 565.

It is an arithmetic number, because the mean of its divisors is an integer number (6006).

2⁶⁵⁵⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72072).

65500 is an abundant number, since it is smaller than the sum of its proper divisors (78644).

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

65500 is a wasteful number, since it uses less digits than its factorization.

65500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 65500 is about 255.9296778414. The cubic root of 65500 is about 40.3100898946.

It can be divided in two parts, 65 and 500, that added together give a palindrome (565).

The spelling of 65500 in words is "sixty-five thousand, five hundred".