166715009 has 4 divisors (see below), whose sum is σ = 166752516. Its totient is φ = 166677504.

The previous prime is 166714981. The next prime is 166715011. The reversal of 166715009 is 900517661.

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 127690000 + 39025009 = 11300^2 + 6247^2 .

It is a cyclic number.

It is not a de Polignac number, because 166715009 - 2⁸ = 166714753 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 166715009.

It is not an unprimeable number, because it can be changed into a prime (166715089) 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, 11024 + ... + 21329.

It is an arithmetic number, because the mean of its divisors is an integer number (41688129).

Almost surely, 2^166715009 is an apocalyptic number.

It is an amenable number.

166715009 is a deficient number, since it is larger than the sum of its proper divisors (37507).

166715009 is an equidigital number, since it uses as much as digits as its factorization.

166715009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37506.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 166715009 is about 12911.8166421306. The cubic root of 166715009 is about 550.3744106281.

The spelling of 166715009 in words is "one hundred sixty-six million, seven hundred fifteen thousand, nine".