12556810254838 has 4 divisors (see below), whose sum is σ = 18835215382260. Its totient is φ = 6278405127418.

The previous prime is 12556810254809. The next prime is 12556810254841. The reversal of 12556810254838 is 83845201865521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3139202563708 + ... + 3139202563711.

It is an arithmetic number, because the mean of its divisors is an integer number (4708803845565).

Almost surely, 2^{12556810254838} is an apocalyptic number.

12556810254838 is a deficient number, since it is larger than the sum of its proper divisors (6278405127422).

12556810254838 is an equidigital number, since it uses as much as digits as its factorization.

12556810254838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6278405127421.

The product of its (nonzero) digits is 18432000, while the sum is 58.

The spelling of 12556810254838 in words is "twelve trillion, five hundred fifty-six billion, eight hundred ten million, two hundred fifty-four thousand, eight hundred thirty-eight".