12805385305 has 8 divisors (see below), whose sum is σ = 15380843400. Its totient is φ = 10234720896.

The previous prime is 12805385231. The next prime is 12805385317. The reversal of 12805385305 is 50358350821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 722319376 + 12083065929 = 26876^2 + 109923^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12805385305 - 2¹³ = 12805377113 is a prime.

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, 1192540 + ... + 1203229.

It is an arithmetic number, because the mean of its divisors is an integer number (1922605425).

Almost surely, 2^12805385305 is an apocalyptic number.

It is an amenable number.

12805385305 is a deficient number, since it is larger than the sum of its proper divisors (2575458095).

12805385305 is a wasteful number, since it uses less digits than its factorization.

12805385305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396843.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 12805385305 in words is "twelve billion, eight hundred five million, three hundred eighty-five thousand, three hundred five".