164121917171 has 4 divisors (see below), whose sum is σ = 164338723632. Its totient is φ = 163905110712.

The previous prime is 164121917161. The next prime is 164121917207. The reversal of 164121917171 is 171719121461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164121917171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164121917161) 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, 108402095 + ... + 108403608.

It is an arithmetic number, because the mean of its divisors is an integer number (41084680908).

Almost surely, 2^164121917171 is an apocalyptic number.

164121917171 is a deficient number, since it is larger than the sum of its proper divisors (216806461).

164121917171 is an equidigital number, since it uses as much as digits as its factorization.

164121917171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216806460.

The product of its digits is 21168, while the sum is 41.

The spelling of 164121917171 in words is "one hundred sixty-four billion, one hundred twenty-one million, nine hundred seventeen thousand, one hundred seventy-one".