13128321753865 has 8 divisors (see below), whose sum is σ = 16583143268160. Its totient is φ = 9949885960752.

The previous prime is 13128321753863. The next prime is 13128321753959. The reversal of 13128321753865 is 56835712382131.

It is a happy number.

13128321753865 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 a cyclic number.

It is not a de Polignac number, because 13128321753865 - 2¹ = 13128321753863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13128321753863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69096430189 + ... + 69096430378.

It is an arithmetic number, because the mean of its divisors is an integer number (2072892908520).

Almost surely, 2^{13128321753865} is an apocalyptic number.

It is an amenable number.

13128321753865 is a deficient number, since it is larger than the sum of its proper divisors (3454821514295).

13128321753865 is a wasteful number, since it uses less digits than its factorization.

13128321753865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138192860591.

The product of its digits is 7257600, while the sum is 55.

The spelling of 13128321753865 in words is "thirteen trillion, one hundred twenty-eight billion, three hundred twenty-one million, seven hundred fifty-three thousand, eight hundred sixty-five".