166096809 has 6 divisors (see below), whose sum is σ = 239917626. Its totient is φ = 110731200.

The previous prime is 166096771. The next prime is 166096813. The reversal of 166096809 is 908690661.

It can be written as a sum of positive squares in only one way, i.e., 89359209 + 76737600 = 9453^2 + 8760^2 .

It is not a de Polignac number, because 166096809 - 2⁹ = 166096297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166056809) 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 5 ways as a sum of consecutive naturals, for example, 9227592 + ... + 9227609.

It is an arithmetic number, because the mean of its divisors is an integer number (39986271).

Almost surely, 2^166096809 is an apocalyptic number.

It is an amenable number.

166096809 is a deficient number, since it is larger than the sum of its proper divisors (73820817).

166096809 is a wasteful number, since it uses less digits than its factorization.

166096809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18455207 (or 18455204 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 166096809 is about 12887.8550969508. The cubic root of 166096809 is about 549.6932824287.

The spelling of 166096809 in words is "one hundred sixty-six million, ninety-six thousand, eight hundred nine".