12643204505 has 8 divisors (see below), whose sum is σ = 15268482312. Its totient is φ = 10050139008.

The previous prime is 12643204499. The next prime is 12643204529. The reversal of 12643204505 is 50540234621.

It can be written as a sum of positive squares in 4 ways, for example, as 477335104 + 12165869401 = 21848^2 + 110299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12643204505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8052212 + ... + 8053781.

It is an arithmetic number, because the mean of its divisors is an integer number (1908560289).

Almost surely, 2^12643204505 is an apocalyptic number.

It is an amenable number.

12643204505 is a deficient number, since it is larger than the sum of its proper divisors (2625277807).

12643204505 is a wasteful number, since it uses less digits than its factorization.

12643204505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16106155.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 12643204505 in words is "twelve billion, six hundred forty-three million, two hundred four thousand, five hundred five".