18003718807 has 4 divisors (see below), whose sum is σ = 18272431096. Its totient is φ = 17735006520.

The previous prime is 18003718787. The next prime is 18003718829. The reversal of 18003718807 is 70881730081.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18003718807 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 (18003718867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134356044 + ... + 134356177.

It is an arithmetic number, because the mean of its divisors is an integer number (4568107774).

Almost surely, 2^18003718807 is an apocalyptic number.

18003718807 is a deficient number, since it is larger than the sum of its proper divisors (268712289).

18003718807 is an equidigital number, since it uses as much as digits as its factorization.

18003718807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268712288.

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 18003718807 in words is "eighteen billion, three million, seven hundred eighteen thousand, eight hundred seven".