166180901809 has 8 divisors (see below), whose sum is σ = 178967214272. Its totient is φ = 153395041680.

The previous prime is 166180901797. The next prime is 166180901827. The reversal of 166180901809 is 908109081661.

It is a happy number.

166180901809 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 a de Polignac number, because none of the positive numbers 2^k-166180901809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166120901809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389082 + ... + 1503964.

It is an arithmetic number, because the mean of its divisors is an integer number (22370901784).

Almost surely, 2^166180901809 is an apocalyptic number.

It is an amenable number.

166180901809 is a deficient number, since it is larger than the sum of its proper divisors (12786312463).

166180901809 is a wasteful number, since it uses less digits than its factorization.

166180901809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226167.

The product of its (nonzero) digits is 186624, while the sum is 49.

The spelling of 166180901809 in words is "one hundred sixty-six billion, one hundred eighty million, nine hundred one thousand, eight hundred nine".