12686779936 has 24 divisors (see below), whose sum is σ = 25508528640. Its totient is φ = 6208423488.

The previous prime is 12686779927. The next prime is 12686779949. The reversal of 12686779936 is 63997768621.

It is a happy number.

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, 4216176 + ... + 4219183.

It is an arithmetic number, because the mean of its divisors is an integer number (1062855360).

Almost surely, 2^12686779936 is an apocalyptic number.

12686779936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12686779936 is an abundant number, since it is smaller than the sum of its proper divisors (12821748704).

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

12686779936 is an equidigital number, since it uses as much as digits as its factorization.

12686779936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8435416 (or 8435408 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 64.

The spelling of 12686779936 in words is "twelve billion, six hundred eighty-six million, seven hundred seventy-nine thousand, nine hundred thirty-six".