181568422472 has 16 divisors (see below), whose sum is σ = 345104365740.
Its totient is φ = 89540591616.
The previous prime is 181568422447. The next prime is 181568422481. The reversal of 181568422472 is 274224865181.
It can be written as a sum of positive squares in 2 ways, for example, as 180178176676 + 1390245796 = 424474^2 + 37286^2
It is a self number, because there is not a number n which added to its sum of digits gives 181568422472.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155451833 + ... + 155453000.
Almost surely, 2181568422472 is an apocalyptic number.
It is an amenable number.
181568422472 is a deficient number, since it is larger than the sum of its proper divisors (163535943268).
181568422472 is a wasteful number, since it uses less digits than its factorization.
181568422472 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 310904912 (or 310904908 counting only the distinct ones).
The product of its digits is 1720320, while the sum is 50.
The spelling of 181568422472 in words is "one hundred eighty-one billion, five hundred sixty-eight million, four hundred twenty-two thousand, four hundred seventy-two".