66016500 has 96 divisors (see below), whose sum is σ = 209768832. Its totient is φ = 16000000.

The previous prime is 66016493. The next prime is 66016501. The reversal of 66016500 is 561066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66016501) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 14500 + ... + 18500.

It is an arithmetic number, because the mean of its divisors is an integer number (2185092).

Almost surely, 2^66016500 is an apocalyptic number.

66016500 is a gapful number since it is divisible by the number (60) 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 66016500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104884416).

66016500 is an abundant number, since it is smaller than the sum of its proper divisors (143752332).

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

66016500 is a wasteful number, since it uses less digits than its factorization.

66016500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034 (or 4022 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66016500 is about 8125.0538459754. The cubic root of 66016500 is about 404.1576762564.

Adding to 66016500 its reverse (561066), we get a palindrome (66577566).

It can be divided in two parts, 660 and 16500, that multiplied together give a square (10890000 = 3300²).

The spelling of 66016500 in words is "sixty-six million, sixteen thousand, five hundred".