166210989 has 48 divisors (see below), whose sum is σ = 275099328. Its totient is φ = 88693248.

The previous prime is 166210973. The next prime is 166210991. The reversal of 166210989 is 989012661.

It is not a de Polignac number, because 166210989 - 2⁴ = 166210973 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166210989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166210589) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 567127 + ... + 567419.

It is an arithmetic number, because the mean of its divisors is an integer number (5731236).

Almost surely, 2^166210989 is an apocalyptic number.

It is an amenable number.

166210989 is a deficient number, since it is larger than the sum of its proper divisors (108888339).

166210989 is a wasteful number, since it uses less digits than its factorization.

166210989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 166210989 is about 12892.2840877790. The cubic root of 166210989 is about 549.8192122060.

The spelling of 166210989 in words is "one hundred sixty-six million, two hundred ten thousand, nine hundred eighty-nine".