13438688643 has 16 divisors (see below), whose sum is σ = 19932272640. Its totient is φ = 8948728872.

The previous prime is 13438688629. The next prime is 13438688663. The reversal of 13438688643 is 34688683431.

It is not a de Polignac number, because 13438688643 - 2⁵ = 13438688611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13438688643.

It is not an unprimeable number, because it can be changed into a prime (13438688663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265071 + ... + 311672.

It is an arithmetic number, because the mean of its divisors is an integer number (1245767040).

Almost surely, 2^13438688643 is an apocalyptic number.

13438688643 is a deficient number, since it is larger than the sum of its proper divisors (6493583997).

13438688643 is an equidigital number, since it uses as much as digits as its factorization.

13438688643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577615 (or 577609 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 54.

The spelling of 13438688643 in words is "thirteen billion, four hundred thirty-eight million, six hundred eighty-eight thousand, six hundred forty-three".