12678386643 has 48 divisors (see below), whose sum is σ = 20213313120. Its totient is φ = 7608287232.

The previous prime is 12678386639. The next prime is 12678386659. The reversal of 12678386643 is 34668387621.

It is not a de Polignac number, because 12678386643 - 2² = 12678386639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12678386643.

It is not an unprimeable number, because it can be changed into a prime (12678386683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3806803 + ... + 3810131.

It is an arithmetic number, because the mean of its divisors is an integer number (421110690).

Almost surely, 2^12678386643 is an apocalyptic number.

12678386643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12678386643 is a deficient number, since it is larger than the sum of its proper divisors (7534926477).

12678386643 is a wasteful number, since it uses less digits than its factorization.

12678386643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148 (or 4145 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The spelling of 12678386643 in words is "twelve billion, six hundred seventy-eight million, three hundred eighty-six thousand, six hundred forty-three".