166906009 has 8 divisors (see below), whose sum is σ = 174566592. Its totient is φ = 159279120.

The previous prime is 166906007. The next prime is 166906021. The reversal of 166906009 is 900609661.

166906009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 166906009 - 2¹ = 166906007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166906007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1999 + ... + 18379.

It is an arithmetic number, because the mean of its divisors is an integer number (21820824).

Almost surely, 2^166906009 is an apocalyptic number.

It is an amenable number.

166906009 is a deficient number, since it is larger than the sum of its proper divisors (7660583).

166906009 is a wasteful number, since it uses less digits than its factorization.

166906009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16847.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 166906009 is about 12919.2108505125. The cubic root of 166906009 is about 550.5845124736.

The spelling of 166906009 in words is "one hundred sixty-six million, nine hundred six thousand, nine".