6664938394666 has 8 divisors (see below), whose sum is σ = 9997705935684. Its totient is φ = 3332369749440.

The previous prime is 6664938394651. The next prime is 6664938394691.

6664938394666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 6481479515625 + 183458879041 = 2545875^2 + 428321^2 .

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 = 6664938394592 and 6664938394601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49640145 + ... + 49774228.

Almost surely, 2^{6664938394666} is an apocalyptic number.

6664938394666 is a deficient number, since it is larger than the sum of its proper divisors (3332767541018).

6664938394666 is a wasteful number, since it uses less digits than its factorization.

6664938394666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99447896.

The product of its digits is 4353564672, while the sum is 76.

The spelling of 6664938394666 in words is "six trillion, six hundred sixty-four billion, nine hundred thirty-eight million, three hundred ninety-four thousand, six hundred sixty-six".