13531643556 has 24 divisors (see below), whose sum is σ = 31642041984. Its totient is φ = 4500804000.

The previous prime is 13531643539. The next prime is 13531643557. The reversal of 13531643556 is 65534613531.

It is a happy number.

13531643556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (13531643557) 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 7 ways as a sum of consecutive naturals, for example, 1212195 + ... + 1223306.

It is an arithmetic number, because the mean of its divisors is an integer number (1318418416).

Almost surely, 2^13531643556 is an apocalyptic number.

It is an amenable number.

13531643556 is an abundant number, since it is smaller than the sum of its proper divisors (18110398428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13531643556 is a wasteful number, since it uses less digits than its factorization.

13531643556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435971 (or 2435969 counting only the distinct ones).

The product of its digits is 486000, while the sum is 42.

The spelling of 13531643556 in words is "thirteen billion, five hundred thirty-one million, six hundred forty-three thousand, five hundred fifty-six".