18717413503 has 4 divisors (see below), whose sum is σ = 18729640648. Its totient is φ = 18705186360.

The previous prime is 18717413471. The next prime is 18717413509. The reversal of 18717413503 is 30531471781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18717413503 - 2⁵ = 18717413471 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 (18717413509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6111276 + ... + 6114337.

It is an arithmetic number, because the mean of its divisors is an integer number (4682410162).

Almost surely, 2^18717413503 is an apocalyptic number.

18717413503 is a deficient number, since it is larger than the sum of its proper divisors (12227145).

18717413503 is a wasteful number, since it uses less digits than its factorization.

18717413503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12227144.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 18717413503 in words is "eighteen billion, seven hundred seventeen million, four hundred thirteen thousand, five hundred three".