12638272786818 has 128 divisors (see below), whose sum is σ = 30560550912000. Its totient is φ = 3406247836992.

The previous prime is 12638272786817. The next prime is 12638272786819. The reversal of 12638272786818 is 81868727283621.

It is an interprime number because it is at equal distance from previous prime (12638272786817) and next prime (12638272786819).

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12638272786817) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65763033 + ... + 65954931.

It is an arithmetic number, because the mean of its divisors is an integer number (238754304000).

Almost surely, 2^{12638272786818} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12638272786818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15280275456000).

12638272786818 is an abundant number, since it is smaller than the sum of its proper divisors (17922278125182).

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

12638272786818 is a wasteful number, since it uses less digits than its factorization.

12638272786818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192876.

The product of its digits is 173408256, while the sum is 69.

The spelling of 12638272786818 in words is "twelve trillion, six hundred thirty-eight billion, two hundred seventy-two million, seven hundred eighty-six thousand, eight hundred eighteen".