8666543220 has 48 divisors (see below), whose sum is σ = 25693754688. Its totient is φ = 2175132160.

The previous prime is 8666543191. The next prime is 8666543257. The reversal of 8666543220 is 223456668.

It is a happy number.

It is a nialpdrome in base 10.

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 15 ways as a sum of consecutive naturals, for example, 4247286 + ... + 4249325.

It is an arithmetic number, because the mean of its divisors is an integer number (535286556).

Almost surely, 2^8666543220 is an apocalyptic number.

It is an amenable number.

8666543220 is an abundant number, since it is smaller than the sum of its proper divisors (17027211468).

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

8666543220 is a wasteful number, since it uses less digits than its factorization.

8666543220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496640 (or 8496638 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 8666543220 is about 93094.2706078092. The cubic root of 8666543220 is about 2054.0702965366.

Adding to 8666543220 its reverse (223456668), we get a palindrome (8889999888).

The spelling of 8666543220 in words is "eight billion, six hundred sixty-six million, five hundred forty-three thousand, two hundred twenty".