12564022236 has 24 divisors (see below), whose sum is σ = 29340658704. Its totient is φ = 4184492160.

The previous prime is 12564022223. The next prime is 12564022259. The reversal of 12564022236 is 63222046521.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12564022197 and 12564022206.

It is a congruent number.

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, 424495 + ... + 453126.

It is an arithmetic number, because the mean of its divisors is an integer number (1222527446).

Almost surely, 2^12564022236 is an apocalyptic number.

It is an amenable number.

12564022236 is an abundant number, since it is smaller than the sum of its proper divisors (16776636468).

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

12564022236 is a wasteful number, since it uses less digits than its factorization.

12564022236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878821 (or 878819 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 12564022236 its reverse (63222046521), we get a palindrome (75786068757).

The spelling of 12564022236 in words is "twelve billion, five hundred sixty-four million, twenty-two thousand, two hundred thirty-six".