13218825818 has 16 divisors (see below), whose sum is σ = 21633310656. Its totient is φ = 6007861440.

The previous prime is 13218825817. The next prime is 13218825821. The reversal of 13218825818 is 81852881231.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (13218825817) 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, 192530 + ... + 252002.

It is an arithmetic number, because the mean of its divisors is an integer number (1352081916).

Almost surely, 2^13218825818 is an apocalyptic number.

13218825818 is a deficient number, since it is larger than the sum of its proper divisors (8414484838).

13218825818 is a wasteful number, since it uses less digits than its factorization.

13218825818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69589.

The product of its digits is 245760, while the sum is 47.

The spelling of 13218825818 in words is "thirteen billion, two hundred eighteen million, eight hundred twenty-five thousand, eight hundred eighteen".