12665406625 has 8 divisors (see below), whose sum is σ = 15806427624. Its totient is φ = 10132325200.

The previous prime is 12665406617. The next prime is 12665406629. The reversal of 12665406625 is 52660456621.

It is a happy number.

12665406625 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 1918352401 + 10747054224 = 43799^2 + 103668^2 .

It is not a de Polignac number, because 12665406625 - 2³ = 12665406617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12665406629) 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, 50661502 + ... + 50661751.

It is an arithmetic number, because the mean of its divisors is an integer number (1975803453).

Almost surely, 2^12665406625 is an apocalyptic number.

It is an amenable number.

12665406625 is a deficient number, since it is larger than the sum of its proper divisors (3141020999).

12665406625 is an equidigital number, since it uses as much as digits as its factorization.

12665406625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101323268 (or 101323258 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 12665406625 in words is "twelve billion, six hundred sixty-five million, four hundred six thousand, six hundred twenty-five".