666668606 has 8 divisors (see below), whose sum is σ = 1000116120. Its totient is φ = 333296568.

The previous prime is 666668591. The next prime is 666668641. The reversal of 666668606 is 606866666.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 16400 + ... + 40028.

It is an arithmetic number, because the mean of its divisors is an integer number (125014515).

Almost surely, 2^666668606 is an apocalyptic number.

666668606 is a deficient number, since it is larger than the sum of its proper divisors (333447514).

666668606 is a wasteful number, since it uses less digits than its factorization.

666668606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37738.

The product of its (nonzero) digits is 2239488, while the sum is 50.

The square root of 666668606 is about 25819.9265297173. The cubic root of 666668606 is about 873.5813118173.

The spelling of 666668606 in words is "six hundred sixty-six million, six hundred sixty-eight thousand, six hundred six".