166194163491 has 8 divisors (see below), whose sum is σ = 222519383040. Its totient is φ = 110332526472.

The previous prime is 166194163481. The next prime is 166194163517. The reversal of 166194163491 is 194361491661.

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

It is not a de Polignac number, because 166194163491 - 2⁵ = 166194163459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166194163481) 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, 115894795 + ... + 115896228.

It is an arithmetic number, because the mean of its divisors is an integer number (27814922880).

Almost surely, 2^166194163491 is an apocalyptic number.

166194163491 is a deficient number, since it is larger than the sum of its proper divisors (56325219549).

166194163491 is a wasteful number, since it uses less digits than its factorization.

166194163491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231791265.

The product of its digits is 839808, while the sum is 51.

The spelling of 166194163491 in words is "one hundred sixty-six billion, one hundred ninety-four million, one hundred sixty-three thousand, four hundred ninety-one".