18282187172 has 6 divisors (see below), whose sum is σ = 31993827558. Its totient is φ = 9141093584.

The previous prime is 18282187129. The next prime is 18282187199. The reversal of 18282187172 is 27178128281.

It can be written as a sum of positive squares in only one way, i.e., 17801963776 + 480223396 = 133424^2 + 21914^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2285273393 + ... + 2285273400.

It is an arithmetic number, because the mean of its divisors is an integer number (5332304593).

Almost surely, 2^18282187172 is an apocalyptic number.

It is an amenable number.

18282187172 is a deficient number, since it is larger than the sum of its proper divisors (13711640386).

18282187172 is a wasteful number, since it uses less digits than its factorization.

18282187172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4570546797 (or 4570546795 counting only the distinct ones).

The product of its digits is 200704, while the sum is 47.

The spelling of 18282187172 in words is "eighteen billion, two hundred eighty-two million, one hundred eighty-seven thousand, one hundred seventy-two".