18103358507 has 4 divisors (see below), whose sum is σ = 19495924560. Its totient is φ = 16710792456.

The previous prime is 18103358503. The next prime is 18103358521. The reversal of 18103358507 is 70585330181.

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 18103358507 - 2² = 18103358503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18103358501) 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, 696283007 + ... + 696283032.

It is an arithmetic number, because the mean of its divisors is an integer number (4873981140).

Almost surely, 2^18103358507 is an apocalyptic number.

18103358507 is a deficient number, since it is larger than the sum of its proper divisors (1392566053).

18103358507 is a wasteful number, since it uses less digits than its factorization.

18103358507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392566052.

The product of its (nonzero) digits is 100800, while the sum is 41.

Adding to 18103358507 its reverse (70585330181), we get a palindrome (88688688688).

The spelling of 18103358507 in words is "eighteen billion, one hundred three million, three hundred fifty-eight thousand, five hundred seven".