12638900025 has 18 divisors (see below), whose sum is σ = 22637674670. Its totient is φ = 6740746560.

The previous prime is 12638900003. The next prime is 12638900081. The reversal of 12638900025 is 52000983621.

12638900025 is a `hidden beast` number, since 12 + 638 + 9 + 0 + 0 + 0 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 104530176 + 12534369849 = 10224^2 + 111957^2 .

It is not a de Polignac number, because 12638900025 - 2¹⁰ = 12638899001 is a prime.

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 17 ways as a sum of consecutive naturals, for example, 28086220 + ... + 28086669.

Almost surely, 2^12638900025 is an apocalyptic number.

12638900025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12638900025 is a deficient number, since it is larger than the sum of its proper divisors (9998774645).

12638900025 is a wasteful number, since it uses less digits than its factorization.

12638900025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56172905 (or 56172897 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 12638900025 in words is "twelve billion, six hundred thirty-eight million, nine hundred thousand, twenty-five".