166802989 has 4 divisors (see below), whose sum is σ = 167250556. Its totient is φ = 166355424.

The previous prime is 166802981. The next prime is 166803001. The reversal of 166802989 is 989208661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989208661 = 7 ⋅141315523.

It can be written as a sum of positive squares in 2 ways, for example, as 136188900 + 30614089 = 11670^2 + 5533^2 .

It is a cyclic number.

It is not a de Polignac number, because 166802989 - 2³ = 166802981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166802981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223224 + ... + 223969.

It is an arithmetic number, because the mean of its divisors is an integer number (41812639).

Almost surely, 2^166802989 is an apocalyptic number.

It is an amenable number.

166802989 is a deficient number, since it is larger than the sum of its proper divisors (447567).

166802989 is an equidigital number, since it uses as much as digits as its factorization.

166802989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447566.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 166802989 is about 12915.2231494465. The cubic root of 166802989 is about 550.4712094018.

The spelling of 166802989 in words is "one hundred sixty-six million, eight hundred two thousand, nine hundred eighty-nine".