12705724685 has 8 divisors (see below), whose sum is σ = 15263147256. Its totient is φ = 10153728000.

The previous prime is 12705724663. The next prime is 12705724687. The reversal of 12705724685 is 58642750721.

It can be written as a sum of positive squares in 4 ways, for example, as 60497284 + 12645227401 = 7778^2 + 112451^2 .

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

It is not a de Polignac number, because 12705724685 - 2²⁸ = 12437289229 is a prime.

It is a super-2 number, since 2×12705724685² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12705724687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351316 + ... + 1360685.

It is an arithmetic number, because the mean of its divisors is an integer number (1907893407).

Almost surely, 2^12705724685 is an apocalyptic number.

It is an amenable number.

12705724685 is a deficient number, since it is larger than the sum of its proper divisors (2557422571).

12705724685 is an equidigital number, since it uses as much as digits as its factorization.

12705724685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712943.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 12705724685 in words is "twelve billion, seven hundred five million, seven hundred twenty-four thousand, six hundred eighty-five".