166180009 has 8 divisors (see below), whose sum is σ = 167106240. Its totient is φ = 165257136.

The previous prime is 166179997. The next prime is 166180073. The reversal of 166180009 is 900081661.

It is a happy number.

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-166180009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166180709) 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, 256524 + ... + 257170.

It is an arithmetic number, because the mean of its divisors is an integer number (20888280).

Almost surely, 2^166180009 is an apocalyptic number.

It is an amenable number.

166180009 is a deficient number, since it is larger than the sum of its proper divisors (926231).

166180009 is an equidigital number, since it uses as much as digits as its factorization.

166180009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 166180009 is about 12891.0825379407. The cubic root of 166180009 is about 549.7850498888.

The spelling of 166180009 in words is "one hundred sixty-six million, one hundred eighty thousand, nine".