12660355643 has 24 divisors (see below), whose sum is σ = 14158929600. Its totient is φ = 11308687104.

The previous prime is 12660355619. The next prime is 12660355649. The reversal of 12660355643 is 34655306621.

It is a de Polignac number, because none of the positive numbers 2^k-12660355643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12660355643.

It is not an unprimeable number, because it can be changed into a prime (12660355649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 697973 + ... + 715881.

It is an arithmetic number, because the mean of its divisors is an integer number (589955400).

Almost surely, 2^12660355643 is an apocalyptic number.

12660355643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12660355643 is a deficient number, since it is larger than the sum of its proper divisors (1498573957).

12660355643 is a wasteful number, since it uses less digits than its factorization.

12660355643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18071 (or 18058 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 12660355643 in words is "twelve billion, six hundred sixty million, three hundred fifty-five thousand, six hundred forty-three".