12658685621 has 8 divisors (see below), whose sum is σ = 12788199000. Its totient is φ = 12529254400.

The previous prime is 12658685603. The next prime is 12658685653.

12658685621 is nontrivially palindromic in base 10.

12658685621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8009355025 + 4649330596 = 89495^2 + 68186^2 .

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-12658685621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12658685621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12658685021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317405 + ... + 355053.

It is an arithmetic number, because the mean of its divisors is an integer number (1598524875).

Almost surely, 2^12658685621 is an apocalyptic number.

It is an amenable number.

12658685621 is a deficient number, since it is larger than the sum of its proper divisors (129513379).

12658685621 is a wasteful number, since it uses less digits than its factorization.

12658685621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41079.

The product of its digits is 1382400, while the sum is 50.

The spelling of 12658685621 in words is "twelve billion, six hundred fifty-eight million, six hundred eighty-five thousand, six hundred twenty-one".