13256742565 has 8 divisors (see below), whose sum is σ = 17354281248. Its totient is φ = 9641267280.

The previous prime is 13256742563. The next prime is 13256742593. The reversal of 13256742565 is 56524765231.

It is a happy number.

13256742565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13256742565 - 2¹ = 13256742563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13256742563) 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 7 ways as a sum of consecutive naturals, for example, 120515787 + ... + 120515896.

It is an arithmetic number, because the mean of its divisors is an integer number (2169285156).

Almost surely, 2^13256742565 is an apocalyptic number.

It is an amenable number.

13256742565 is a deficient number, since it is larger than the sum of its proper divisors (4097538683).

13256742565 is a wasteful number, since it uses less digits than its factorization.

13256742565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241031699.

The product of its digits is 1512000, while the sum is 46.

The spelling of 13256742565 in words is "thirteen billion, two hundred fifty-six million, seven hundred forty-two thousand, five hundred sixty-five".