12660355644 has 24 divisors (see below), whose sum is σ = 29981739648. Its totient is φ = 4157131440.

The previous prime is 12660355619. The next prime is 12660355649. The reversal of 12660355644 is 44655306621.

It is a junction number, because it is equal to n+sod(n) for n = 12660355596 and 12660355605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12660355649) 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, 7872552 + ... + 7874159.

It is an arithmetic number, because the mean of its divisors is an integer number (1249239152).

Almost surely, 2^12660355644 is an apocalyptic number.

It is an amenable number.

12660355644 is an abundant number, since it is smaller than the sum of its proper divisors (17321384004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12660355644 is a wasteful number, since it uses less digits than its factorization.

12660355644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15746785 (or 15746783 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 12660355644 in words is "twelve billion, six hundred sixty million, three hundred fifty-five thousand, six hundred forty-four".