666222116320 has 48 divisors (see below), whose sum is σ = 1576169975520. Its totient is φ = 266112935424.

The previous prime is 666222116317. The next prime is 666222116321. The reversal of 666222116320 is 23611222666.

It is a super-2 number, since 2×666222116320² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666222116320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666222116321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2823012 + ... + 3049891.

It is an arithmetic number, because the mean of its divisors is an integer number (32836874490).

Almost surely, 2^666222116320 is an apocalyptic number.

It is an amenable number.

666222116320 is an abundant number, since it is smaller than the sum of its proper divisors (909947859200).

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

666222116320 is a wasteful number, since it uses less digits than its factorization.

666222116320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5873627 (or 5873619 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 666222116320 its reverse (23611222666), we get a palindrome (689833338986).

The spelling of 666222116320 in words is "six hundred sixty-six billion, two hundred twenty-two million, one hundred sixteen thousand, three hundred twenty".