66656633665666 has 8 divisors (see below), whose sum is σ = 109074491452944. Its totient is φ = 30298469848020.

The previous prime is 66656633665591. The next prime is 66656633665673.

66656633665666 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 66656633665592 and 66656633665601.

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, 1514923492380 + ... + 1514923492423.

It is an arithmetic number, because the mean of its divisors is an integer number (13634311431618).

Almost surely, 2^{66656633665666} is an apocalyptic number.

66656633665666 is a deficient number, since it is larger than the sum of its proper divisors (42417857787278).

66656633665666 is a wasteful number, since it uses less digits than its factorization.

66656633665666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029846984816.

The product of its digits is 13604889600, while the sum is 76.

The spelling of 66656633665666 in words is "sixty-six trillion, six hundred fifty-six billion, six hundred thirty-three million, six hundred sixty-five thousand, six hundred sixty-six".