13578512785 has 4 divisors (see below), whose sum is σ = 16294215348. Its totient is φ = 10862810224.

The previous prime is 13578512743. The next prime is 13578512797. The reversal of 13578512785 is 58721587531.

13578512785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5943947409 + 7634565376 = 77097^2 + 87376^2 .

It is a cyclic number.

It is not a de Polignac number, because 13578512785 - 2⁷ = 13578512657 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1357851274 + ... + 1357851283.

It is an arithmetic number, because the mean of its divisors is an integer number (4073553837).

Almost surely, 2^13578512785 is an apocalyptic number.

It is an amenable number.

13578512785 is a deficient number, since it is larger than the sum of its proper divisors (2715702563).

13578512785 is an equidigital number, since it uses as much as digits as its factorization.

13578512785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715702562.

The product of its digits is 2352000, while the sum is 52.

The spelling of 13578512785 in words is "thirteen billion, five hundred seventy-eight million, five hundred twelve thousand, seven hundred eighty-five".