161918614224242 has 18 divisors (see below), whose sum is σ = 243551451269997. Its totient is φ = 80735416372584.

The previous prime is 161918614224209. The next prime is 161918614224281. The reversal of 161918614224242 is 242422416819161.

It can be written as a sum of positive squares in 2 ways, for example, as 147593365737601 + 14325248486641 = 12148801^2 + 3784871^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8997739.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6604328168 + ... + 6604352684.

Almost surely, 2^{161918614224242} is an apocalyptic number.

161918614224242 is a deficient number, since it is larger than the sum of its proper divisors (81632837045755).

161918614224242 is an frugal number, since it uses more digits than its factorization.

161918614224242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49770 (or 24886 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 53.

The spelling of 161918614224242 in words is "one hundred sixty-one trillion, nine hundred eighteen billion, six hundred fourteen million, two hundred twenty-four thousand, two hundred forty-two".