18438317137 has 8 divisors (see below), whose sum is σ = 18464690304. Its totient is φ = 18411964368.

The previous prime is 18438317123. The next prime is 18438317159. The reversal of 18438317137 is 73171383481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18438317137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18438317437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2768103 + ... + 2774755.

It is an arithmetic number, because the mean of its divisors is an integer number (2308086288).

Almost surely, 2^18438317137 is an apocalyptic number.

It is an amenable number.

18438317137 is a deficient number, since it is larger than the sum of its proper divisors (26373167).

18438317137 is a wasteful number, since it uses less digits than its factorization.

18438317137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10199.

The product of its digits is 338688, while the sum is 46.

The spelling of 18438317137 in words is "eighteen billion, four hundred thirty-eight million, three hundred seventeen thousand, one hundred thirty-seven".