12645861678 has 24 divisors (see below), whose sum is σ = 27615115008. Its totient is φ = 4182095232.

The previous prime is 12645861677. The next prime is 12645861703. The reversal of 12645861678 is 87616854621.

12645861678 is a `hidden beast` number, since 1 + 26 + 458 + 6 + 167 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12645861677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2763651 + ... + 2768222.

It is an arithmetic number, because the mean of its divisors is an integer number (1150629792).

Almost surely, 2^12645861678 is an apocalyptic number.

12645861678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12645861678 is an abundant number, since it is smaller than the sum of its proper divisors (14969253330).

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

12645861678 is a wasteful number, since it uses less digits than its factorization.

12645861678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532008 (or 5532005 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 12645861678 in words is "twelve billion, six hundred forty-five million, eight hundred sixty-one thousand, six hundred seventy-eight".