66006500 has 48 divisors (see below), whose sum is σ = 164760960. Its totient is φ = 22629600.

The previous prime is 66006491. The next prime is 66006503. The reversal of 66006500 is 560066.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66006503) 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 15 ways as a sum of consecutive naturals, for example, 5930 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (3432520).

Almost surely, 2^66006500 is an apocalyptic number.

It is an amenable number.

66006500 is an abundant number, since it is smaller than the sum of its proper divisors (98754460).

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

66006500 is a wasteful number, since it uses less digits than its factorization.

66006500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18885 (or 18873 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 66006500 is about 8124.4384421325. The cubic root of 66006500 is about 404.1372683238.

Adding to 66006500 its reverse (560066), we get a palindrome (66566566).

The spelling of 66006500 in words is "sixty-six million, six thousand, five hundred".