12307823818 has 4 divisors (see below), whose sum is σ = 18461735730. Its totient is φ = 6153911908.

The previous prime is 12307823813. The next prime is 12307823849. The reversal of 12307823818 is 81832870321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81832870321 = 10463 ⋅7821167.

It can be written as a sum of positive squares in only one way, i.e., 7885972809 + 4421851009 = 88803^2 + 66497^2 .

It is not an unprimeable number, because it can be changed into a prime (12307823813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3076955953 + ... + 3076955956.

Almost surely, 2^12307823818 is an apocalyptic number.

12307823818 is a deficient number, since it is larger than the sum of its proper divisors (6153911912).

12307823818 is an equidigital number, since it uses as much as digits as its factorization.

12307823818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6153911911.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 12307823818 in words is "twelve billion, three hundred seven million, eight hundred twenty-three thousand, eight hundred eighteen".