12640233236 has 12 divisors (see below), whose sum is σ = 22248273012. Its totient is φ = 6283583808.

The previous prime is 12640233197. The next prime is 12640233241. The reversal of 12640233236 is 63233204621.

12640233236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11587230736 + 1053002500 = 107644^2 + 32450^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9132425 + ... + 9133808.

It is an arithmetic number, because the mean of its divisors is an integer number (1854022751).

Almost surely, 2^12640233236 is an apocalyptic number.

It is an amenable number.

12640233236 is a deficient number, since it is larger than the sum of its proper divisors (9608039776).

12640233236 is a wasteful number, since it uses less digits than its factorization.

12640233236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18266410 (or 18266408 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

Adding to 12640233236 its reverse (63233204621), we get a palindrome (75873437857).

The spelling of 12640233236 in words is "twelve billion, six hundred forty million, two hundred thirty-three thousand, two hundred thirty-six".