181465771922 has 6 divisors (see below), whose sum is σ = 272199561543. Its totient is φ = 90732584742.

The previous prime is 181465771889. The next prime is 181465771967. The reversal of 181465771922 is 229177564181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 90732885961 + 90732885961 = 301219^2 + 301219^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=301219.

It is a Duffinian number.

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, 451829 + ... + 753047.

Almost surely, 2^181465771922 is an apocalyptic number.

181465771922 is a deficient number, since it is larger than the sum of its proper divisors (90733789621).

181465771922 is an frugal number, since it uses more digits than its factorization.

181465771922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602440 (or 301221 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 53.

The spelling of 181465771922 in words is "one hundred eighty-one billion, four hundred sixty-five million, seven hundred seventy-one thousand, nine hundred twenty-two".