666636812012 has 24 divisors (see below), whose sum is σ = 1176210223104. Its totient is φ = 330578578512.

The previous prime is 666636812011. The next prime is 666636812041. The reversal of 666636812012 is 210218636666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666636812011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1239323 + ... + 1693869.

It is an arithmetic number, because the mean of its divisors is an integer number (49008759296).

Almost surely, 2^666636812012 is an apocalyptic number.

It is an amenable number.

666636812012 is a deficient number, since it is larger than the sum of its proper divisors (509573411092).

666636812012 is a wasteful number, since it uses less digits than its factorization.

666636812012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457565 (or 457563 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 666636812012 in words is "six hundred sixty-six billion, six hundred thirty-six million, eight hundred twelve thousand, twelve".