12640624105 has 12 divisors (see below), whose sum is σ = 15547752396. Its totient is φ = 9865846400.

The previous prime is 12640624097. The next prime is 12640624123. The reversal of 12640624105 is 50142604621.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3884156329 + 8756467776 = 62323^2 + 93576^2 .

It is not a de Polignac number, because 12640624105 - 2³ = 12640624097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 743566 + ... + 760375.

It is an arithmetic number, because the mean of its divisors is an integer number (1295646033).

Almost surely, 2^12640624105 is an apocalyptic number.

It is an amenable number.

12640624105 is a deficient number, since it is larger than the sum of its proper divisors (2907128291).

12640624105 is an equidigital number, since it uses as much as digits as its factorization.

12640624105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504028 (or 1503987 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 12640624105 in words is "twelve billion, six hundred forty million, six hundred twenty-four thousand, one hundred five".