13644643543 has 2 divisors, whose sum is σ = 13644643544. Its totient is φ = 13644643542.

The previous prime is 13644643511. The next prime is 13644643567. The reversal of 13644643543 is 34534644631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13644643543 - 2⁵ = 13644643511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13644643543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13644644543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822321771 + 6822321772.

It is an arithmetic number, because the mean of its divisors is an integer number (6822321772).

Almost surely, 2^13644643543 is an apocalyptic number.

13644643543 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644643543 is an equidigital number, since it uses as much as digits as its factorization.

13644643543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 43.

The spelling of 13644643543 in words is "thirteen billion, six hundred forty-four million, six hundred forty-three thousand, five hundred forty-three".