12506904643 has 4 divisors (see below), whose sum is σ = 12509409528. Its totient is φ = 12504399760.

The previous prime is 12506904629. The next prime is 12506904659. The reversal of 12506904643 is 34640960521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12506904643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12506904596 and 12506904605.

It is not an unprimeable number, because it can be changed into a prime (12506905643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244938 + ... + 1254943.

It is an arithmetic number, because the mean of its divisors is an integer number (3127352382).

Almost surely, 2^12506904643 is an apocalyptic number.

12506904643 is a deficient number, since it is larger than the sum of its proper divisors (2504885).

12506904643 is an equidigital number, since it uses as much as digits as its factorization.

12506904643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504884.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 12506904643 in words is "twelve billion, five hundred six million, nine hundred four thousand, six hundred forty-three".