166193309 has 8 divisors (see below), whose sum is σ = 176369400. Its totient is φ = 156061696.

The previous prime is 166193303. The next prime is 166193317. The reversal of 166193309 is 903391661.

It can be written as a sum of positive squares in 4 ways, for example, as 24226084 + 141967225 = 4922^2 + 11915^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166193309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166193303) 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 7 ways as a sum of consecutive naturals, for example, 3254 + ... + 18519.

It is an arithmetic number, because the mean of its divisors is an integer number (22046175).

Almost surely, 2^166193309 is an apocalyptic number.

It is an amenable number.

166193309 is a deficient number, since it is larger than the sum of its proper divisors (10176091).

166193309 is a wasteful number, since it uses less digits than its factorization.

166193309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22239.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 166193309 is about 12891.5983880976. The cubic root of 166193309 is about 549.7997166070.

The spelling of 166193309 in words is "one hundred sixty-six million, one hundred ninety-three thousand, three hundred nine".