166975129 has 4 divisors (see below), whose sum is σ = 167814400. Its totient is φ = 166135860.

The previous prime is 166975099. The next prime is 166975141. The reversal of 166975129 is 921579661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 921579661 = 29 ⋅31778609.

It is a cyclic number.

It is not a de Polignac number, because 166975129 - 2¹⁹ = 166450841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166975169) 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 3 ways as a sum of consecutive naturals, for example, 419337 + ... + 419734.

It is an arithmetic number, because the mean of its divisors is an integer number (41953600).

Almost surely, 2^166975129 is an apocalyptic number.

It is an amenable number.

166975129 is a deficient number, since it is larger than the sum of its proper divisors (839271).

166975129 is an equidigital number, since it uses as much as digits as its factorization.

166975129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839270.

The product of its digits is 204120, while the sum is 46.

The square root of 166975129 is about 12921.8856596087. The cubic root of 166975129 is about 550.6605056420.

The spelling of 166975129 in words is "one hundred sixty-six million, nine hundred seventy-five thousand, one hundred twenty-nine".