12665203238 has 4 divisors (see below), whose sum is σ = 18997804860. Its totient is φ = 6332601618.

The previous prime is 12665203231. The next prime is 12665203241. The reversal of 12665203238 is 83230256621.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665203231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166300808 + ... + 3166300811.

It is an arithmetic number, because the mean of its divisors is an integer number (4749451215).

Almost surely, 2^12665203238 is an apocalyptic number.

12665203238 is a deficient number, since it is larger than the sum of its proper divisors (6332601622).

12665203238 is an equidigital number, since it uses as much as digits as its factorization.

12665203238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332601621.

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 12665203238 its reverse (83230256621), we get a palindrome (95895459859).

The spelling of 12665203238 in words is "twelve billion, six hundred sixty-five million, two hundred three thousand, two hundred thirty-eight".