13556113521 has 12 divisors (see below), whose sum is σ = 19076194512. Its totient is φ = 8561755224.

The previous prime is 13556113517. The next prime is 13556113541. The reversal of 13556113521 is 12531165531.

It is not a de Polignac number, because 13556113521 - 2² = 13556113517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13556113541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6257511 + ... + 6259676.

It is an arithmetic number, because the mean of its divisors is an integer number (1589682876).

Almost surely, 2^13556113521 is an apocalyptic number.

It is an amenable number.

13556113521 is a deficient number, since it is larger than the sum of its proper divisors (5520080991).

13556113521 is a wasteful number, since it uses less digits than its factorization.

13556113521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12517228 (or 12517209 counting only the distinct ones).

The product of its digits is 13500, while the sum is 33.

The spelling of 13556113521 in words is "thirteen billion, five hundred fifty-six million, one hundred thirteen thousand, five hundred twenty-one".