166212572209 has 8 divisors (see below), whose sum is σ = 166452416640. Its totient is φ = 165972821376.

The previous prime is 166212572171. The next prime is 166212572293. The reversal of 166212572209 is 902275212661.

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 166212572209 - 2⁹ = 166212571697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166212572909) 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, 4027809 + ... + 4068865.

It is an arithmetic number, because the mean of its divisors is an integer number (20806552080).

Almost surely, 2^166212572209 is an apocalyptic number.

It is an amenable number.

166212572209 is a deficient number, since it is larger than the sum of its proper divisors (239844431).

166212572209 is an equidigital number, since it uses as much as digits as its factorization.

166212572209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46799.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 166212572209 in words is "one hundred sixty-six billion, two hundred twelve million, five hundred seventy-two thousand, two hundred nine".