166489129 has 4 divisors (see below), whose sum is σ = 168769876. Its totient is φ = 164208384.

The previous prime is 166489123. The next prime is 166489133. The reversal of 166489129 is 921984661.

It is a happy number.

166489129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52533504 + 113955625 = 7248^2 + 10675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166489129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166489123) 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, 1140264 + ... + 1140409.

It is an arithmetic number, because the mean of its divisors is an integer number (42192469).

Almost surely, 2^166489129 is an apocalyptic number.

It is an amenable number.

166489129 is a deficient number, since it is larger than the sum of its proper divisors (2280747).

166489129 is an equidigital number, since it uses as much as digits as its factorization.

166489129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280746.

The product of its digits is 186624, while the sum is 46.

The square root of 166489129 is about 12903.0666509943. The cubic root of 166489129 is about 550.1257332379.

The spelling of 166489129 in words is "one hundred sixty-six million, four hundred eighty-nine thousand, one hundred twenty-nine".