166699986 has 8 divisors (see below), whose sum is σ = 333399984. Its totient is φ = 55566660.

The previous prime is 166699889. The next prime is 166699993. The reversal of 166699986 is 689996661.

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

166699986 is an admirable 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, 13891660 + ... + 13891671.

It is an arithmetic number, because the mean of its divisors is an integer number (41674998).

Almost surely, 2^166699986 is an apocalyptic number.

166699986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

166699986 is a wasteful number, since it uses less digits than its factorization.

166699986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27783336.

The product of its digits is 7558272, while the sum is 60.

The square root of 166699986 is about 12911.2348751001. The cubic root of 166699986 is about 550.3578783771.

The spelling of 166699986 in words is "one hundred sixty-six million, six hundred ninety-nine thousand, nine hundred eighty-six".