12643020336 has 20 divisors (see below), whose sum is σ = 32661135992. Its totient is φ = 4214340096.

The previous prime is 12643020323. The next prime is 12643020419. The reversal of 12643020336 is 63302034621.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131698081 + ... + 131698176.

Almost surely, 2^12643020336 is an apocalyptic number.

12643020336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12643020336 is an abundant number, since it is smaller than the sum of its proper divisors (20018115656).

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

12643020336 is a wasteful number, since it uses less digits than its factorization.

12643020336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263396268 (or 263396262 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

Adding to 12643020336 its reverse (63302034621), we get a palindrome (75945054957).

The spelling of 12643020336 in words is "twelve billion, six hundred forty-three million, twenty thousand, three hundred thirty-six".