12564535554 has 24 divisors (see below), whose sum is σ = 27958922940. Its totient is φ = 4074984288.

The previous prime is 12564535553. The next prime is 12564535589. The reversal of 12564535554 is 45553546521.

12564535554 is a `hidden beast` number, since 1 + 2 + 5 + 64 + 5 + 35 + 554 = 666.

12564535554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12415084929 + 149450625 = 111423^2 + 12225^2 .

It is not an unprimeable number, because it can be changed into a prime (12564535553) 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 11 ways as a sum of consecutive naturals, for example, 9432169 + ... + 9433500.

Almost surely, 2^12564535554 is an apocalyptic number.

12564535554 is an abundant number, since it is smaller than the sum of its proper divisors (15394387386).

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

12564535554 is a wasteful number, since it uses less digits than its factorization.

12564535554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18865714 (or 18865711 counting only the distinct ones).

The product of its digits is 1800000, while the sum is 45.

The spelling of 12564535554 in words is "twelve billion, five hundred sixty-four million, five hundred thirty-five thousand, five hundred fifty-four".