12587533805 has 72 divisors (see below), whose sum is σ = 20450687544. Its totient is φ = 7384903680.

The previous prime is 12587533759. The next prime is 12587533807. The reversal of 12587533805 is 50833578521.

It can be written as a sum of positive squares in 4 ways, for example, as 258984649 + 12328549156 = 16093^2 + 111034^2 .

It is not a de Polignac number, because 12587533805 - 2⁶ = 12587533741 is a prime.

It is a super-3 number, since 3×12587533805³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12587533805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12587533807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 491477 + ... + 516453.

It is an arithmetic number, because the mean of its divisors is an integer number (284037327).

Almost surely, 2^12587533805 is an apocalyptic number.

It is an amenable number.

12587533805 is a deficient number, since it is larger than the sum of its proper divisors (7863153739).

12587533805 is a wasteful number, since it uses less digits than its factorization.

12587533805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25035 (or 25017 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 12587533805 in words is "twelve billion, five hundred eighty-seven million, five hundred thirty-three thousand, eight hundred five".