666442402666 has 8 divisors (see below), whose sum is σ = 1000963558980. Its totient is φ = 332787883008.

The previous prime is 666442402663. The next prime is 666442402669. The reversal of 666442402666 is 666204244666.

It is an interprime number because it is at equal distance from previous prime (666442402663) and next prime (666442402669).

It can be written as a sum of positive squares in 2 ways, for example, as 625989528025 + 40452874641 = 791195^2 + 201129^2 .

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

It is not an unprimeable number, because it can be changed into a prime (666442402663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216657241 + ... + 216660316.

Almost surely, 2^666442402666 is an apocalyptic number.

666442402666 is a deficient number, since it is larger than the sum of its proper divisors (334521156314).

666442402666 is a wasteful number, since it uses less digits than its factorization.

666442402666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433318328.

The product of its (nonzero) digits is 11943936, while the sum is 52.

The spelling of 666442402666 in words is "six hundred sixty-six billion, four hundred forty-two million, four hundred two thousand, six hundred sixty-six".