163823409161 has 2 divisors, whose sum is σ = 163823409162. Its totient is φ = 163823409160.

The previous prime is 163823409157. The next prime is 163823409163. The reversal of 163823409161 is 161904328361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104613433600 + 59209975561 = 323440^2 + 243331^2 .

It is an emirp because it is prime and its reverse (161904328361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163823409161 - 2² = 163823409157 is a prime.

Together with 163823409163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163823409163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81911704580 + 81911704581.

It is an arithmetic number, because the mean of its divisors is an integer number (81911704581).

Almost surely, 2^163823409161 is an apocalyptic number.

It is an amenable number.

163823409161 is a deficient number, since it is larger than the sum of its proper divisors (1).

163823409161 is an equidigital number, since it uses as much as digits as its factorization.

163823409161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 163823409161 in words is "one hundred sixty-three billion, eight hundred twenty-three million, four hundred nine thousand, one hundred sixty-one".