12643322136 has 64 divisors (see below), whose sum is σ = 32180842080. Its totient is φ = 4138337280.

The previous prime is 12643322117. The next prime is 12643322137. The reversal of 12643322136 is 63122334621.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12643322097 and 12643322106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643322137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896290 + ... + 910286.

Almost surely, 2^12643322136 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 12643322136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16090421040).

12643322136 is an abundant number, since it is smaller than the sum of its proper divisors (19537519944).

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

12643322136 is a wasteful number, since it uses less digits than its factorization.

12643322136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14684 (or 14680 counting only the distinct ones).

The product of its digits is 31104, while the sum is 33.

Adding to 12643322136 its reverse (63122334621), we get a palindrome (75765656757).

The spelling of 12643322136 in words is "twelve billion, six hundred forty-three million, three hundred twenty-two thousand, one hundred thirty-six".