166193671491 has 48 divisors (see below), whose sum is σ = 256349104128. Its totient is φ = 103390560000.

The previous prime is 166193671477. The next prime is 166193671537. The reversal of 166193671491 is 194176391661.

166193671491 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 93 + 67 + 1 + 491 = 666.

166193671491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166193671491 - 2⁵ = 166193671459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166193671471) 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 47 ways as a sum of consecutive naturals, for example, 12630766 + ... + 12643916.

It is an arithmetic number, because the mean of its divisors is an integer number (5340606336).

Almost surely, 2^166193671491 is an apocalyptic number.

166193671491 is a deficient number, since it is larger than the sum of its proper divisors (90155432637).

166193671491 is a wasteful number, since it uses less digits than its factorization.

166193671491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13872 (or 13869 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The spelling of 166193671491 in words is "one hundred sixty-six billion, one hundred ninety-three million, six hundred seventy-one thousand, four hundred ninety-one".