166606521172 has 48 divisors (see below), whose sum is σ = 363168312192. Its totient is φ = 65116160640.

The previous prime is 166606521161. The next prime is 166606521173. The reversal of 166606521172 is 271125606661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166606521173) 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 15 ways as a sum of consecutive naturals, for example, 2727079 + ... + 2787502.

It is an arithmetic number, because the mean of its divisors is an integer number (7566006504).

Almost surely, 2^166606521172 is an apocalyptic number.

It is an amenable number.

166606521172 is an abundant number, since it is smaller than the sum of its proper divisors (196561791020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166606521172 is a wasteful number, since it uses less digits than its factorization.

166606521172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5514688 (or 5514686 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 166606521172 in words is "one hundred sixty-six billion, six hundred six million, five hundred twenty-one thousand, one hundred seventy-two".