66654245666 has 8 divisors (see below), whose sum is σ = 100253798400. Its totient is φ = 33236312868.

The previous prime is 66654245597. The next prime is 66654245687.

It is a happy number.

66654245666 is nontrivially palindromic in base 10.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45404066 + ... + 45405533.

It is an arithmetic number, because the mean of its divisors is an integer number (12531724800).

Almost surely, 2^66654245666 is an apocalyptic number.

66654245666 is a deficient number, since it is larger than the sum of its proper divisors (33599552734).

66654245666 is a wasteful number, since it uses less digits than its factorization.

66654245666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90809968.

The product of its digits is 37324800, while the sum is 56.

The spelling of 66654245666 in words is "sixty-six billion, six hundred fifty-four million, two hundred forty-five thousand, six hundred sixty-six".