166012809 has 16 divisors (see below), whose sum is σ = 227040000. Its totient is φ = 107842896.

The previous prime is 166012799. The next prime is 166012829. The reversal of 166012809 is 908210661.

166012809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166012809 - 2⁴ = 166012793 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166012809.

It is not an unprimeable number, because it can be changed into a prime (166012829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63082 + ... + 65660.

It is an arithmetic number, because the mean of its divisors is an integer number (14190000).

Almost surely, 2^166012809 is an apocalyptic number.

It is an amenable number.

166012809 is a deficient number, since it is larger than the sum of its proper divisors (61027191).

166012809 is a wasteful number, since it uses less digits than its factorization.

166012809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 166012809 is about 12884.5958027406. The cubic root of 166012809 is about 549.6006014954.

The spelling of 166012809 in words is "one hundred sixty-six million, twelve thousand, eight hundred nine".