666063644636 has 48 divisors (see below), whose sum is σ = 1308038034240. Its totient is φ = 294646894080.

The previous prime is 666063644599. The next prime is 666063644639. The reversal of 666063644636 is 636446360666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666063644639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1405400 + ... + 1818591.

It is an arithmetic number, because the mean of its divisors is an integer number (27250792380).

Almost surely, 2^666063644636 is an apocalyptic number.

It is an amenable number.

666063644636 is a deficient number, since it is larger than the sum of its proper divisors (641974389604).

666063644636 is a wasteful number, since it uses less digits than its factorization.

666063644636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224174 (or 3224172 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 56.

The spelling of 666063644636 in words is "six hundred sixty-six billion, sixty-three million, six hundred forty-four thousand, six hundred thirty-six".