12649433568 has 48 divisors (see below), whose sum is σ = 33214070736. Its totient is φ = 4215296000.

The previous prime is 12649433567. The next prime is 12649433663. The reversal of 12649433568 is 86533494621.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 12649433568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12649433567) 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, 367630 + ... + 400562.

It is an arithmetic number, because the mean of its divisors is an integer number (691959807).

Almost surely, 2^12649433568 is an apocalyptic number.

It is an amenable number.

12649433568 is an abundant number, since it is smaller than the sum of its proper divisors (20564637168).

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

12649433568 is a wasteful number, since it uses less digits than its factorization.

12649433568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36947 (or 36939 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 51.

The spelling of 12649433568 in words is "twelve billion, six hundred forty-nine million, four hundred thirty-three thousand, five hundred sixty-eight".