12533817555 has 48 divisors (see below), whose sum is σ = 25920289440. Its totient is φ = 5729742144.

The previous prime is 12533817529. The next prime is 12533817577. The reversal of 12533817555 is 55571833521.

12533817555 is a `hidden beast` number, since 1 + 2 + 53 + 38 + 17 + 555 = 666.

12533817555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12533817555 - 2⁵ = 12533817523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12533817555.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 940764 + ... + 953993.

It is an arithmetic number, because the mean of its divisors is an integer number (540006030).

Almost surely, 2^12533817555 is an apocalyptic number.

12533817555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12533817555 is an abundant number, since it is smaller than the sum of its proper divisors (13386471885).

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

12533817555 is a wasteful number, since it uses less digits than its factorization.

12533817555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894785 (or 1894772 counting only the distinct ones).

The product of its digits is 630000, while the sum is 45.

The spelling of 12533817555 in words is "twelve billion, five hundred thirty-three million, eight hundred seventeen thousand, five hundred fifty-five".