6666321332220 has 96 divisors (see below), whose sum is σ = 21019439056896. Its totient is φ = 1563946348800.

The previous prime is 6666321332219. The next prime is 6666321332243. The reversal of 6666321332220 is 222331236666.

It is a happy number.

It is a super-2 number, since 2×6666321332220² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162890619 + ... + 162931538.

It is an arithmetic number, because the mean of its divisors is an integer number (218952490176).

Almost surely, 2^{6666321332220} is an apocalyptic number.

6666321332220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6666321332220 is an abundant number, since it is smaller than the sum of its proper divisors (14353117724676).

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

6666321332220 is a wasteful number, since it uses less digits than its factorization.

6666321332220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325822211 (or 325822209 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 42.

Adding to 6666321332220 its reverse (222331236666), we get a palindrome (6888652568886).

The spelling of 6666321332220 in words is "six trillion, six hundred sixty-six billion, three hundred twenty-one million, three hundred thirty-two thousand, two hundred twenty".