161812419922 has 8 divisors (see below), whose sum is σ = 251088237900. Its totient is φ = 78116340624.

The previous prime is 161812419917. The next prime is 161812419941. The reversal of 161812419922 is 229914218161.

It can be written as a sum of positive squares in 2 ways, for example, as 154063315081 + 7749104841 = 392509^2 + 88029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394934597 + ... + 1394934712.

Almost surely, 2^161812419922 is an apocalyptic number.

161812419922 is a deficient number, since it is larger than the sum of its proper divisors (89275817978).

161812419922 is a wasteful number, since it uses less digits than its factorization.

161812419922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789869340.

The product of its digits is 124416, while the sum is 46.

The spelling of 161812419922 in words is "one hundred sixty-one billion, eight hundred twelve million, four hundred nineteen thousand, nine hundred twenty-two".