666712666 has 8 divisors (see below), whose sum is σ = 1007264160. Its totient is φ = 330957948.

The previous prime is 666712637. The next prime is 666712687. The reversal of 666712666 is 666217666.

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

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, 1198846 + ... + 1199401.

It is an arithmetic number, because the mean of its divisors is an integer number (125908020).

Almost surely, 2^666712666 is an apocalyptic number.

666712666 is a deficient number, since it is larger than the sum of its proper divisors (340551494).

666712666 is a wasteful number, since it uses less digits than its factorization.

666712666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398388.

The product of its digits is 653184, while the sum is 46.

The square root of 666712666 is about 25820.7797326107. The cubic root of 666712666 is about 873.6005563337.

The spelling of 666712666 in words is "six hundred sixty-six million, seven hundred twelve thousand, six hundred sixty-six".