166082309 has 4 divisors (see below), whose sum is σ = 166108716. Its totient is φ = 166055904.

The previous prime is 166082291. The next prime is 166082341. The reversal of 166082309 is 903280661.

166082309 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 74822500 + 91259809 = 8650^2 + 9553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166082309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166082359) 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, 2297 + ... + 18369.

It is an arithmetic number, because the mean of its divisors is an integer number (41527179).

It is a Poulet number, since it divides 2^166082308-1.

Almost surely, 2^166082309 is an apocalyptic number.

It is an amenable number.

166082309 is a deficient number, since it is larger than the sum of its proper divisors (26407).

166082309 is a wasteful number, since it uses less digits than its factorization.

166082309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26406.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 166082309 is about 12887.2925395523. The cubic root of 166082309 is about 549.6772861660.

The spelling of 166082309 in words is "one hundred sixty-six million, eighty-two thousand, three hundred nine".