12642238539839 has 4 divisors (see below), whose sum is σ = 13307619515640. Its totient is φ = 11976857564040.

The previous prime is 12642238539787. The next prime is 12642238539859. The reversal of 12642238539839 is 93893583224621.

12642238539839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12642238539839 - 2⁴⁰ = 11542726912063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12642238539859) 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, 332690487872 + ... + 332690487909.

It is an arithmetic number, because the mean of its divisors is an integer number (3326904878910).

Almost surely, 2^{12642238539839} is an apocalyptic number.

12642238539839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12642238539839 is a deficient number, since it is larger than the sum of its proper divisors (665380975801).

12642238539839 is an equidigital number, since it uses as much as digits as its factorization.

12642238539839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665380975800.

The product of its digits is 134369280, while the sum is 65.

The spelling of 12642238539839 in words is "twelve trillion, six hundred forty-two billion, two hundred thirty-eight million, five hundred thirty-nine thousand, eight hundred thirty-nine".