12644377658 has 16 divisors (see below), whose sum is σ = 20895662880. Its totient is φ = 5690538000.

The previous prime is 12644377561. The next prime is 12644377663. The reversal of 12644377658 is 85677344621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2843048 + ... + 2847491.

It is an arithmetic number, because the mean of its divisors is an integer number (1305978930).

Almost surely, 2^12644377658 is an apocalyptic number.

12644377658 is a deficient number, since it is larger than the sum of its proper divisors (8251285222).

12644377658 is a wasteful number, since it uses less digits than its factorization.

12644377658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5690653.

The product of its digits is 6773760, while the sum is 53.

The spelling of 12644377658 in words is "twelve billion, six hundred forty-four million, three hundred seventy-seven thousand, six hundred fifty-eight".