12635636422 has 4 divisors (see below), whose sum is σ = 18953454636. Its totient is φ = 6317818210.

The previous prime is 12635636417. The next prime is 12635636449. The reversal of 12635636422 is 22463653621.

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

It is a Smith number, since the sum of its digits (40) 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, 3158909104 + ... + 3158909107.

It is an arithmetic number, because the mean of its divisors is an integer number (4738363659).

Almost surely, 2^12635636422 is an apocalyptic number.

12635636422 is a deficient number, since it is larger than the sum of its proper divisors (6317818214).

12635636422 is an equidigital number, since it uses as much as digits as its factorization.

12635636422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6317818213.

The product of its digits is 311040, while the sum is 40.

The spelling of 12635636422 in words is "twelve billion, six hundred thirty-five million, six hundred thirty-six thousand, four hundred twenty-two".