12638991138 has 8 divisors (see below), whose sum is σ = 25277982288. Its totient is φ = 4212997044.

The previous prime is 12638991137. The next prime is 12638991181. The reversal of 12638991138 is 83119983621.

It is a sphenic number, since it is the product of 3 distinct primes.

12638991138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (12638991137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053249256 + ... + 1053249267.

It is an arithmetic number, because the mean of its divisors is an integer number (3159747786).

Almost surely, 2^12638991138 is an apocalyptic number.

12638991138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12638991138 is a wasteful number, since it uses less digits than its factorization.

12638991138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106498528.

The product of its digits is 559872, while the sum is 51.

The spelling of 12638991138 in words is "twelve billion, six hundred thirty-eight million, nine hundred ninety-one thousand, one hundred thirty-eight".