6664646464666 has 8 divisors (see below), whose sum is σ = 10052201574324. Its totient is φ = 3313912606560.

The previous prime is 6664646464643. The next prime is 6664646464669.

6664646464666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 6534490750225 + 130155714441 = 2556265^2 + 360771^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6664646464595 and 6664646464604.

It is not an unprimeable number, because it can be changed into a prime (6664646464669) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9205312435 + ... + 9205313158.

Almost surely, 2^{6664646464666} is an apocalyptic number.

6664646464666 is a deficient number, since it is larger than the sum of its proper divisors (3387555109658).

6664646464666 is a wasteful number, since it uses less digits than its factorization.

6664646464666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18410625776.

The product of its digits is 2579890176, while the sum is 70.

The spelling of 6664646464666 in words is "six trillion, six hundred sixty-four billion, six hundred forty-six million, four hundred sixty-four thousand, six hundred sixty-six".