12643679745 has 32 divisors (see below), whose sum is σ = 22483443840. Its totient is φ = 6741558720.

The previous prime is 12643679729. The next prime is 12643679749. The reversal of 12643679745 is 54797634621.

It is not a de Polignac number, because 12643679745 - 2⁴ = 12643679729 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12643679691 and 12643679700.

It is not an unprimeable number, because it can be changed into a prime (12643679749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 646602 + ... + 665868.

It is an arithmetic number, because the mean of its divisors is an integer number (702607620).

Almost surely, 2^12643679745 is an apocalyptic number.

12643679745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12643679745 is a deficient number, since it is larger than the sum of its proper divisors (9839764095).

12643679745 is a wasteful number, since it uses less digits than its factorization.

12643679745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24142 (or 24136 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 12643679745 in words is "twelve billion, six hundred forty-three million, six hundred seventy-nine thousand, seven hundred forty-five".