66521200 has 30 divisors (see below), whose sum is σ = 159818144. Its totient is φ = 26608320.

The previous prime is 66521159. The next prime is 66521207. The reversal of 66521200 is 212566.

66521200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66521207) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 82752 + ... + 83551.

Almost surely, 2^66521200 is an apocalyptic number.

It is an amenable number.

66521200 is an abundant number, since it is smaller than the sum of its proper divisors (93296944).

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

66521200 is a wasteful number, since it uses less digits than its factorization.

66521200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166321 (or 166310 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66521200 is about 8156.0529669688. The cubic root of 66521200 is about 405.1849990565.

Adding to 66521200 its reverse (212566), we get a palindrome (66733766).

The spelling of 66521200 in words is "sixty-six million, five hundred twenty-one thousand, two hundred".