166004689 has 2 divisors, whose sum is σ = 166004690. Its totient is φ = 166004688.

The previous prime is 166004651. The next prime is 166004749. The reversal of 166004689 is 986400661.

166004689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105678400 + 60326289 = 10280^2 + 7767^2 .

It is an emirp because it is prime and its reverse (986400661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166004689 - 2¹⁵ = 165971921 is a prime.

It is not a weakly prime, because it can be changed into another prime (166004389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83002344 + 83002345.

It is an arithmetic number, because the mean of its divisors is an integer number (83002345).

Almost surely, 2^166004689 is an apocalyptic number.

It is an amenable number.

166004689 is a deficient number, since it is larger than the sum of its proper divisors (1).

166004689 is an equidigital number, since it uses as much as digits as its factorization.

166004689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 166004689 is about 12884.2806939309. The cubic root of 166004689 is about 549.5916406815.

The spelling of 166004689 in words is "one hundred sixty-six million, four thousand, six hundred eighty-nine".