12385731818 has 16 divisors (see below), whose sum is σ = 19561957920. Its totient is φ = 5865263856.

The previous prime is 12385731811. The next prime is 12385731851. The reversal of 12385731818 is 81813758321.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12385731811) 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, 95405 + ... + 184047.

It is an arithmetic number, because the mean of its divisors is an integer number (1222622370).

Almost surely, 2^12385731818 is an apocalyptic number.

12385731818 is a deficient number, since it is larger than the sum of its proper divisors (7176226102).

12385731818 is a wasteful number, since it uses less digits than its factorization.

12385731818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92341.

The product of its digits is 322560, while the sum is 47.

The spelling of 12385731818 in words is "twelve billion, three hundred eighty-five million, seven hundred thirty-one thousand, eight hundred eighteen".