161321797322 has 12 divisors (see below), whose sum is σ = 281490075090. Its totient is φ = 69137913096.

The previous prime is 161321797319. The next prime is 161321797331. The reversal of 161321797322 is 223797123161.

161321797322 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 156902339881 + 4419457441 = 396109^2 + 66479^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 823070297 + ... + 823070492.

Almost surely, 2^161321797322 is an apocalyptic number.

161321797322 is a deficient number, since it is larger than the sum of its proper divisors (120168277768).

161321797322 is a wasteful number, since it uses less digits than its factorization.

161321797322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646140805 (or 1646140798 counting only the distinct ones).

The product of its digits is 190512, while the sum is 44.

The spelling of 161321797322 in words is "one hundred sixty-one billion, three hundred twenty-one million, seven hundred ninety-seven thousand, three hundred twenty-two".