161631373922 has 18 divisors (see below), whose sum is σ = 246177702603. Its totient is φ = 79590720132.

The previous prime is 161631373859. The next prime is 161631373927. The reversal of 161631373922 is 229373136161.

It can be written as a sum of positive squares in only one way, i.e., 80815686961 + 80815686961 = 284281^2 + 284281^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=284281.

It is a super-2 number, since 2×161631373922² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161631373927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 38091533 + ... + 38095775.

Almost surely, 2^161631373922 is an apocalyptic number.

161631373922 is a deficient number, since it is larger than the sum of its proper divisors (84546328681).

161631373922 is an frugal number, since it uses more digits than its factorization.

161631373922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8622 (or 4312 counting only the distinct ones).

The product of its digits is 244944, while the sum is 44.

The spelling of 161631373922 in words is "one hundred sixty-one billion, six hundred thirty-one million, three hundred seventy-three thousand, nine hundred twenty-two".