6664444444666 has 8 divisors (see below), whose sum is σ = 9996943990644. Its totient is φ = 3332129781120.

The previous prime is 6664444444657. The next prime is 6664444444667.

6664444444666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 5493731264641 + 1170713180025 = 2343871^2 + 1081995^2 .

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

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6664444444598 and 6664444444607.

It is not an unprimeable number, because it can be changed into a prime (6664444444667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46130455 + ... + 46274698.

Almost surely, 2^{6664444444666} is an apocalyptic number.

6664444444666 is a deficient number, since it is larger than the sum of its proper divisors (3332499545978).

6664444444666 is a wasteful number, since it uses less digits than its factorization.

6664444444666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92441216.

The product of its digits is 764411904, while the sum is 64.

The spelling of 6664444444666 in words is "six trillion, six hundred sixty-four billion, four hundred forty-four million, four hundred forty-four thousand, six hundred sixty-six".