166980666 has 16 divisors (see below), whose sum is σ = 345477600. Its totient is φ = 53740848.

The previous prime is 166980661. The next prime is 166980673. The reversal of 166980666 is 666089661.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166980661) 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 7 ways as a sum of consecutive naturals, for example, 479656 + ... + 480003.

It is an arithmetic number, because the mean of its divisors is an integer number (21592350).

Almost surely, 2^166980666 is an apocalyptic number.

166980666 is an abundant number, since it is smaller than the sum of its proper divisors (178496934).

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

166980666 is a wasteful number, since it uses less digits than its factorization.

166980666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959693.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 166980666 is about 12922.0999067489. The cubic root of 166980666 is about 550.6665923240. Note that the first 3 decimals are identical.

The spelling of 166980666 in words is "one hundred sixty-six million, nine hundred eighty thousand, six hundred sixty-six".