13556804640 has 48 divisors (see below), whose sum is σ = 42703936128. Its totient is φ = 3615147776.

The previous prime is 13556804621. The next prime is 13556804671. The reversal of 13556804640 is 4640865531.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 13556804592 and 13556804601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14121192 + ... + 14122151.

It is an arithmetic number, because the mean of its divisors is an integer number (889665336).

Almost surely, 2^13556804640 is an apocalyptic number.

13556804640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13556804640 is an abundant number, since it is smaller than the sum of its proper divisors (29147131488).

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

13556804640 is a wasteful number, since it uses less digits than its factorization.

13556804640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28243361 (or 28243353 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 13556804640 in words is "thirteen billion, five hundred fifty-six million, eight hundred four thousand, six hundred forty".