161829118161 has 16 divisors (see below), whose sum is σ = 242074485120. Its totient is φ = 106838639280.

The previous prime is 161829118141. The next prime is 161829118163. The reversal of 161829118161 is 161811928161.

It is a happy number.

161829118161 is a `hidden beast` number, since 1 + 618 + 2 + 9 + 1 + 18 + 16 + 1 = 666.

It is not a de Polignac number, because 161829118161 - 2⁶ = 161829118097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161829118163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29092710 + ... + 29098271.

It is an arithmetic number, because the mean of its divisors is an integer number (15129655320).

Almost surely, 2^161829118161 is an apocalyptic number.

It is an amenable number.

161829118161 is a deficient number, since it is larger than the sum of its proper divisors (80245366959).

161829118161 is a wasteful number, since it uses less digits than its factorization.

161829118161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58191093 (or 58191087 counting only the distinct ones).

The product of its digits is 41472, while the sum is 45.

The spelling of 161829118161 in words is "one hundred sixty-one billion, eight hundred twenty-nine million, one hundred eighteen thousand, one hundred sixty-one".