666536635666 has 8 divisors (see below), whose sum is σ = 1090696312944. Its totient is φ = 302971198020.

The previous prime is 666536635649. The next prime is 666536635717.

It is a happy number.

666536635666 is nontrivially palindromic in base 10.

666536635666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 666536635598 and 666536635607.

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, 15148559880 + ... + 15148559923.

It is an arithmetic number, because the mean of its divisors is an integer number (136337039118).

Almost surely, 2^666536635666 is an apocalyptic number.

666536635666 is a deficient number, since it is larger than the sum of its proper divisors (424159677278).

666536635666 is a wasteful number, since it uses less digits than its factorization.

666536635666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30297119816.

The product of its digits is 377913600, while the sum is 64.

The spelling of 666536635666 in words is "six hundred sixty-six billion, five hundred thirty-six million, six hundred thirty-five thousand, six hundred sixty-six".