66670904666 has 8 divisors (see below), whose sum is σ = 102445536564. Its totient is φ = 32522392480.

The previous prime is 66670904653. The next prime is 66670904681. The reversal of 66670904666 is 66640907666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65986820641 + 684084025 = 256879^2 + 26155^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406529825 + ... + 406529988.

Almost surely, 2^66670904666 is an apocalyptic number.

66670904666 is a deficient number, since it is larger than the sum of its proper divisors (35774631898).

66670904666 is a wasteful number, since it uses less digits than its factorization.

66670904666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813059856.

The product of its (nonzero) digits is 11757312, while the sum is 56.

The spelling of 66670904666 in words is "sixty-six billion, six hundred seventy million, nine hundred four thousand, six hundred sixty-six".