12505808905 has 8 divisors (see below), whose sum is σ = 15161682312. Its totient is φ = 9901506048.

The previous prime is 12505808897. The next prime is 12505808947. The reversal of 12505808905 is 50980850521.

It can be written as a sum of positive squares in 4 ways, for example, as 2576882169 + 9928926736 = 50763^2 + 99644^2 .

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 12505808905 - 2³ = 12505808897 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, 12892102 + ... + 12893071.

It is an arithmetic number, because the mean of its divisors is an integer number (1895210289).

Almost surely, 2^12505808905 is an apocalyptic number.

It is an amenable number.

12505808905 is a deficient number, since it is larger than the sum of its proper divisors (2655873407).

12505808905 is an equidigital number, since it uses as much as digits as its factorization.

12505808905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25785275.

The product of its (nonzero) digits is 144000, while the sum is 43.

The spelling of 12505808905 in words is "twelve billion, five hundred five million, eight hundred eight thousand, nine hundred five".