666506550118 has 8 divisors (see below), whose sum is σ = 1058569226712. Its totient is φ = 313650141216.

The previous prime is 666506550089. The next prime is 666506550121. The reversal of 666506550118 is 811055605666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9801566880 + ... + 9801566947.

It is an arithmetic number, because the mean of its divisors is an integer number (132321153339).

Almost surely, 2^666506550118 is an apocalyptic number.

666506550118 is a deficient number, since it is larger than the sum of its proper divisors (392062676594).

666506550118 is a wasteful number, since it uses less digits than its factorization.

666506550118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19603133846.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 666506550118 in words is "six hundred sixty-six billion, five hundred six million, five hundred fifty thousand, one hundred eighteen".