161322904871 has 4 divisors (see below), whose sum is σ = 161494343544. Its totient is φ = 161151466200.

The previous prime is 161322904817. The next prime is 161322904957. The reversal of 161322904871 is 178409223161.

161322904871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-161322904871 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 (161322904271) 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 3 ways as a sum of consecutive naturals, for example, 85717925 + ... + 85719806.

It is an arithmetic number, because the mean of its divisors is an integer number (40373585886).

Almost surely, 2^161322904871 is an apocalyptic number.

161322904871 is a deficient number, since it is larger than the sum of its proper divisors (171438673).

161322904871 is an equidigital number, since it uses as much as digits as its factorization.

161322904871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171438672.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 161322904871 in words is "one hundred sixty-one billion, three hundred twenty-two million, nine hundred four thousand, eight hundred seventy-one".