13644003243 has 48 divisors (see below), whose sum is σ = 20349014400. Its totient is φ = 8123012352.

The previous prime is 13644003209. The next prime is 13644003251. The reversal of 13644003243 is 34230044631.

It is not a de Polignac number, because 13644003243 - 2³³ = 5054068651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13644003243.

It is not an unprimeable number, because it can be changed into a prime (13644003343) 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 47 ways as a sum of consecutive naturals, for example, 2329783 + ... + 2335631.

It is an arithmetic number, because the mean of its divisors is an integer number (423937800).

Almost surely, 2^13644003243 is an apocalyptic number.

13644003243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13644003243 is a deficient number, since it is larger than the sum of its proper divisors (6705011157).

13644003243 is a wasteful number, since it uses less digits than its factorization.

13644003243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6028 (or 6015 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 13644003243 its reverse (34230044631), we get a palindrome (47874047874).

The spelling of 13644003243 in words is "thirteen billion, six hundred forty-four million, three thousand, two hundred forty-three".