12638605312605 has 16 divisors (see below), whose sum is σ = 21286072105920. Its totient is φ = 6385821631488.

The previous prime is 12638605312589. The next prime is 12638605312609. The reversal of 12638605312605 is 50621350683621.

It is not a de Polignac number, because 12638605312605 - 2⁴ = 12638605312589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638605312609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22172991492 + ... + 22172992061.

It is an arithmetic number, because the mean of its divisors is an integer number (1330379506620).

Almost surely, 2^{12638605312605} is an apocalyptic number.

12638605312605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12638605312605 is a deficient number, since it is larger than the sum of its proper divisors (8647466793315).

12638605312605 is a wasteful number, since it uses less digits than its factorization.

12638605312605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44345983580.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 12638605312605 in words is "twelve trillion, six hundred thirty-eight billion, six hundred five million, three hundred twelve thousand, six hundred five".