18113994517 has 8 divisors (see below), whose sum is σ = 19028419200. Its totient is φ = 17210141520.

The previous prime is 18113994499. The next prime is 18113994539. The reversal of 18113994517 is 71549931181.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18113994517 - 2⁷ = 18113994389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18113994317) 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, 2639409 + ... + 2646262.

It is an arithmetic number, because the mean of its divisors is an integer number (2378552400).

Almost surely, 2^18113994517 is an apocalyptic number.

It is an amenable number.

18113994517 is a deficient number, since it is larger than the sum of its proper divisors (914424683).

18113994517 is a wasteful number, since it uses less digits than its factorization.

18113994517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285843.

The product of its digits is 272160, while the sum is 49.

The spelling of 18113994517 in words is "eighteen billion, one hundred thirteen million, nine hundred ninety-four thousand, five hundred seventeen".