12820904425638 has 24 divisors (see below), whose sum is σ = 28033476042000. Its totient is φ = 4234427149104.

The previous prime is 12820904425597. The next prime is 12820904425643. The reversal of 12820904425638 is 83652440902821.

12820904425638 is a `hidden beast` number, since 1 + 2 + 8 + 209 + 0 + 4 + 425 + 6 + 3 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3267302938 + ... + 3267306861.

It is an arithmetic number, because the mean of its divisors is an integer number (1168061501750).

Almost surely, 2^{12820904425638} is an apocalyptic number.

12820904425638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12820904425638 is an abundant number, since it is smaller than the sum of its proper divisors (15212571616362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12820904425638 is a wasteful number, since it uses less digits than its factorization.

12820904425638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6534609916 (or 6534609913 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 12820904425638 in words is "twelve trillion, eight hundred twenty billion, nine hundred four million, four hundred twenty-five thousand, six hundred thirty-eight".