18349172068 has 6 divisors (see below), whose sum is σ = 32111051126. Its totient is φ = 9174586032.

The previous prime is 18349172041. The next prime is 18349172077. The reversal of 18349172068 is 86027194381.

It can be written as a sum of positive squares in only one way, i.e., 15052345344 + 3296826724 = 122688^2 + 57418^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2293646505 + ... + 2293646512.

Almost surely, 2^18349172068 is an apocalyptic number.

It is an amenable number.

18349172068 is a deficient number, since it is larger than the sum of its proper divisors (13761879058).

18349172068 is a wasteful number, since it uses less digits than its factorization.

18349172068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4587293021 (or 4587293019 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 18349172068 in words is "eighteen billion, three hundred forty-nine million, one hundred seventy-two thousand, sixty-eight".