12665338405 has 8 divisors (see below), whose sum is σ = 15199027200. Its totient is φ = 10131856656.

The previous prime is 12665338339. The next prime is 12665338409. The reversal of 12665338405 is 50483356621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12665338405 - 2¹⁵ = 12665305637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665338409) 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 7 ways as a sum of consecutive naturals, for example, 166476 + ... + 230314.

It is an arithmetic number, because the mean of its divisors is an integer number (1899878400).

Almost surely, 2^12665338405 is an apocalyptic number.

It is an amenable number.

12665338405 is a deficient number, since it is larger than the sum of its proper divisors (2533688795).

12665338405 is an equidigital number, since it uses as much as digits as its factorization.

12665338405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103523.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 12665338405 in words is "twelve billion, six hundred sixty-five million, three hundred thirty-eight thousand, four hundred five".