194995794171 has 4 divisors (see below), whose sum is σ = 259994392232. Its totient is φ = 129997196112.

The previous prime is 194995794167. The next prime is 194995794181. The reversal of 194995794171 is 171497599491.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 194995794171 - 2² = 194995794167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194995794151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32499299026 + ... + 32499299031.

It is an arithmetic number, because the mean of its divisors is an integer number (64998598058).

Almost surely, 2^194995794171 is an apocalyptic number.

194995794171 is a deficient number, since it is larger than the sum of its proper divisors (64998598061).

194995794171 is an equidigital number, since it uses as much as digits as its factorization.

194995794171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64998598060.

The product of its digits is 25719120, while the sum is 66.

The spelling of 194995794171 in words is "one hundred ninety-four billion, nine hundred ninety-five million, seven hundred ninety-four thousand, one hundred seventy-one".