12317749638 has 16 divisors (see below), whose sum is σ = 25236365616. Its totient is φ = 4005772160.

The previous prime is 12317749637. The next prime is 12317749649. The reversal of 12317749638 is 83694771321.

It is a happy number.

It is a super-2 number, since 2×12317749638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12317749637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25035831 + ... + 25036322.

It is an arithmetic number, because the mean of its divisors is an integer number (1577272851).

Almost surely, 2^12317749638 is an apocalyptic number.

12317749638 is an abundant number, since it is smaller than the sum of its proper divisors (12918615978).

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

12317749638 is a wasteful number, since it uses less digits than its factorization.

12317749638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50072199.

The product of its digits is 1524096, while the sum is 51.

The spelling of 12317749638 in words is "twelve billion, three hundred seventeen million, seven hundred forty-nine thousand, six hundred thirty-eight".