66799666 has 8 divisors (see below), whose sum is σ = 100800000. Its totient is φ = 33199668.

The previous prime is 66799609. The next prime is 66799703. The reversal of 66799666 is 66699766.

It is a happy number.

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, 99666 + ... + 100333.

It is an arithmetic number, because the mean of its divisors is an integer number (12600000).

Almost surely, 2^66799666 is an apocalyptic number.

66799666 is a deficient number, since it is larger than the sum of its proper divisors (34000334).

66799666 is a wasteful number, since it uses less digits than its factorization.

66799666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200168.

The product of its digits is 4408992, while the sum is 55.

The square root of 66799666 is about 8173.1062638387. The cubic root of 66799666 is about 405.7495968619.

The spelling of 66799666 in words is "sixty-six million, seven hundred ninety-nine thousand, six hundred sixty-six".