12665540236 has 12 divisors (see below), whose sum is σ = 22166490528. Its totient is φ = 6332257232.

The previous prime is 12665540233. The next prime is 12665540323. The reversal of 12665540236 is 63204556621.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12665540231) 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 in 3 ways as a sum of consecutive naturals, for example, 69691 + ... + 173746.

It is an arithmetic number, because the mean of its divisors is an integer number (1847207544).

Almost surely, 2^12665540236 is an apocalyptic number.

It is an amenable number.

12665540236 is a deficient number, since it is larger than the sum of its proper divisors (9500950292).

12665540236 is a wasteful number, since it uses less digits than its factorization.

12665540236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256448 (or 256446 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 12665540236 in words is "twelve billion, six hundred sixty-five million, five hundred forty thousand, two hundred thirty-six".