12861610636 has 24 divisors (see below), whose sum is σ = 26144916896. Its totient is φ = 5421755520.

The previous prime is 12861610633. The next prime is 12861610667. The reversal of 12861610636 is 63601616821.

It is not an unprimeable number, because it can be changed into a prime (12861610633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3763401 + ... + 3766816.

Almost surely, 2^12861610636 is an apocalyptic number.

It is an amenable number.

12861610636 is an abundant number, since it is smaller than the sum of its proper divisors (13283306260).

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

12861610636 is a wasteful number, since it uses less digits than its factorization.

12861610636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530289 (or 7530287 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 12861610636 in words is "twelve billion, eight hundred sixty-one million, six hundred ten thousand, six hundred thirty-six".