6668356672 has 28 divisors (see below), whose sum is σ = 13590160780. Its totient is φ = 3244064256.

The previous prime is 6668356661. The next prime is 6668356697. The reversal of 6668356672 is 2766538666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6333613056 + 334743616 = 79584^2 + 18296^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405647 + ... + 1410382.

It is an arithmetic number, because the mean of its divisors is an integer number (485362885).

Almost surely, 2^6668356672 is an apocalyptic number.

It is an amenable number.

6668356672 is an abundant number, since it is smaller than the sum of its proper divisors (6921804108).

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

6668356672 is a wasteful number, since it uses less digits than its factorization.

6668356672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816078 (or 2816068 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 55.

The square root of 6668356672 is about 81660.0065638009. The cubic root of 6668356672 is about 1882.2310799162.

The spelling of 6668356672 in words is "six billion, six hundred sixty-eight million, three hundred fifty-six thousand, six hundred seventy-two".