13644320263 has 4 divisors (see below), whose sum is σ = 15593508880. Its totient is φ = 11695131648.

The previous prime is 13644320243. The next prime is 13644320267. The reversal of 13644320263 is 36202344631.

13644320263 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, and also an emirpimes, since its reverse is a distinct semiprime: 36202344631 = 4937 ⋅7332863.

It is a cyclic number.

It is not a de Polignac number, because 13644320263 - 2³³ = 5054385671 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 (13644320267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974594298 + ... + 974594311.

It is an arithmetic number, because the mean of its divisors is an integer number (3898377220).

Almost surely, 2^13644320263 is an apocalyptic number.

13644320263 is a deficient number, since it is larger than the sum of its proper divisors (1949188617).

13644320263 is an equidigital number, since it uses as much as digits as its factorization.

13644320263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949188616.

The product of its (nonzero) digits is 62208, while the sum is 34.

Adding to 13644320263 its reverse (36202344631), we get a palindrome (49846664894).

The spelling of 13644320263 in words is "thirteen billion, six hundred forty-four million, three hundred twenty thousand, two hundred sixty-three".