666636472 has 16 divisors (see below), whose sum is σ = 1250218800. Its totient is φ = 333244800.

The previous prime is 666636449. The next prime is 666636517. The reversal of 666636472 is 274636666.

It is a congruent number.

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, 60597 + ... + 70747.

It is an arithmetic number, because the mean of its divisors is an integer number (78138675).

Almost surely, 2^666636472 is an apocalyptic number.

It is an amenable number.

666636472 is a deficient number, since it is larger than the sum of its proper divisors (583582328).

666636472 is a wasteful number, since it uses less digits than its factorization.

666636472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366 (or 18362 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 46.

The square root of 666636472 is about 25819.3042508895. The cubic root of 666636472 is about 873.5672758017.

The spelling of 666636472 in words is "six hundred sixty-six million, six hundred thirty-six thousand, four hundred seventy-two".