12656415405 has 16 divisors (see below), whose sum is σ = 20356291584. Its totient is φ = 6714745920.

The previous prime is 12656415403. The next prime is 12656415433. The reversal of 12656415405 is 50451465621.

12656415405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12656415405 - 2¹ = 12656415403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656415403) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2205934 + ... + 2211663.

It is an arithmetic number, because the mean of its divisors is an integer number (1272268224).

Almost surely, 2^12656415405 is an apocalyptic number.

12656415405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12656415405 is a deficient number, since it is larger than the sum of its proper divisors (7699876179).

12656415405 is a wasteful number, since it uses less digits than its factorization.

12656415405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4417796.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 12656415405 in words is "twelve billion, six hundred fifty-six million, four hundred fifteen thousand, four hundred five".