166766129 has 4 divisors (see below), whose sum is σ = 167098176. Its totient is φ = 166434084.

The previous prime is 166766051. The next prime is 166766137. The reversal of 166766129 is 921667661.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166766129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166766129.

It is not an unprimeable number, because it can be changed into a prime (166766189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165269 + ... + 166274.

It is an arithmetic number, because the mean of its divisors is an integer number (41774544).

Almost surely, 2^166766129 is an apocalyptic number.

It is an amenable number.

166766129 is a deficient number, since it is larger than the sum of its proper divisors (332047).

166766129 is an equidigital number, since it uses as much as digits as its factorization.

166766129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332046.

The product of its digits is 163296, while the sum is 44.

The square root of 166766129 is about 12913.7960724181. The cubic root of 166766129 is about 550.4306588424.

The spelling of 166766129 in words is "one hundred sixty-six million, seven hundred sixty-six thousand, one hundred twenty-nine".