166112191 has 8 divisors (see below), whose sum is σ = 190530080. Its totient is φ = 141866208.

The previous prime is 166112189. The next prime is 166112213. The reversal of 166112191 is 191211661.

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 166112191 - 2¹ = 166112189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166112101) 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, 40896 + ... + 44773.

It is an arithmetic number, because the mean of its divisors is an integer number (23816260).

Almost surely, 2^166112191 is an apocalyptic number.

166112191 is a deficient number, since it is larger than the sum of its proper divisors (24417889).

166112191 is an equidigital number, since it uses as much as digits as its factorization.

166112191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85953.

The product of its digits is 648, while the sum is 28.

The square root of 166112191 is about 12888.4518465175. The cubic root of 166112191 is about 549.7102506877.

The spelling of 166112191 in words is "one hundred sixty-six million, one hundred twelve thousand, one hundred ninety-one".