666646156 has 24 divisors (see below), whose sum is σ = 1273865040. Its totient is φ = 302740800.

The previous prime is 666646151. The next prime is 666646159. The reversal of 666646156 is 651646666.

It is not an unprimeable number, because it can be changed into a prime (666646151) 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, 45550 + ... + 58378.

It is an arithmetic number, because the mean of its divisors is an integer number (53077710).

Almost surely, 2^666646156 is an apocalyptic number.

It is an amenable number.

666646156 is a deficient number, since it is larger than the sum of its proper divisors (607218884).

666646156 is a wasteful number, since it uses less digits than its factorization.

666646156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14025 (or 14023 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The square root of 666646156 is about 25819.4917843090. The cubic root of 666646156 is about 873.5715057856.

The spelling of 666646156 in words is "six hundred sixty-six million, six hundred forty-six thousand, one hundred fifty-six".