166661210906 has 8 divisors (see below), whose sum is σ = 249995400384. Its totient is φ = 83329410780.

The previous prime is 166661210831. The next prime is 166661210909. The reversal of 166661210906 is 609012166661.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166661210909) by changing a digit.

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, 411380 + ... + 708911.

It is an arithmetic number, because the mean of its divisors is an integer number (31249425048).

Almost surely, 2^166661210906 is an apocalyptic number.

166661210906 is a deficient number, since it is larger than the sum of its proper divisors (83334189478).

166661210906 is a wasteful number, since it uses less digits than its factorization.

166661210906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194676.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 166661210906 in words is "one hundred sixty-six billion, six hundred sixty-one million, two hundred ten thousand, nine hundred six".