12563658368 has 64 divisors (see below), whose sum is σ = 26212057920. Its totient is φ = 5986928640.

The previous prime is 12563658361. The next prime is 12563658383. The reversal of 12563658368 is 86385636521.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (12563658361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 819671 + ... + 834857.

It is an arithmetic number, because the mean of its divisors is an integer number (409563405).

Almost surely, 2^12563658368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12563658368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13106028960).

12563658368 is an abundant number, since it is smaller than the sum of its proper divisors (13648399552).

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

12563658368 is a wasteful number, since it uses less digits than its factorization.

12563658368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15505 (or 15493 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 53.

The spelling of 12563658368 in words is "twelve billion, five hundred sixty-three million, six hundred fifty-eight thousand, three hundred sixty-eight".