13868144639 has 4 divisors (see below), whose sum is σ = 13868385960. Its totient is φ = 13867903320.

The previous prime is 13868144623. The next prime is 13868144683. The reversal of 13868144639 is 93644186831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93644186831 = 13 ⋅7203398987.

It is a cyclic number.

It is not a de Polignac number, because 13868144639 - 2⁴ = 13868144623 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 (13868144539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20909 + ... + 167849.

It is an arithmetic number, because the mean of its divisors is an integer number (3467096490).

Almost surely, 2^13868144639 is an apocalyptic number.

13868144639 is a deficient number, since it is larger than the sum of its proper divisors (241321).

13868144639 is an equidigital number, since it uses as much as digits as its factorization.

13868144639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241320.

The product of its digits is 2985984, while the sum is 53.

The spelling of 13868144639 in words is "thirteen billion, eight hundred sixty-eight million, one hundred forty-four thousand, six hundred thirty-nine".