161608632242 has 6 divisors (see below), whose sum is σ = 242413801149. Its totient is φ = 80804031860.

The previous prime is 161608632223. The next prime is 161608632307. The reversal of 161608632242 is 242236806161.

It can be written as a sum of positive squares in 2 ways, for example, as 159776877841 + 1831754401 = 399721^2 + 42799^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=284261.

It is a super-2 number, since 2×161608632242² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161608632242.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 426392 + ... + 710652.

Almost surely, 2^161608632242 is an apocalyptic number.

161608632242 is a deficient number, since it is larger than the sum of its proper divisors (80805168907).

161608632242 is an frugal number, since it uses more digits than its factorization.

161608632242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568524 (or 284263 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 161608632242 in words is "one hundred sixty-one billion, six hundred eight million, six hundred thirty-two thousand, two hundred forty-two".