13663340765 has 4 divisors (see below), whose sum is σ = 16396008924. Its totient is φ = 10930672608.

The previous prime is 13663340707. The next prime is 13663340767. The reversal of 13663340765 is 56704336631.

It is a happy number.

13663340765 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, and also an emirpimes, since its reverse is a distinct semiprime: 56704336631 = 101483 ⋅558757.

It can be written as a sum of positive squares in 2 ways, for example, as 8191336036 + 5472004729 = 90506^2 + 73973^2 .

It is a cyclic number.

It is not a de Polignac number, because 13663340765 - 2¹² = 13663336669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13663340767) 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 3 ways as a sum of consecutive naturals, for example, 1366334072 + ... + 1366334081.

It is an arithmetic number, because the mean of its divisors is an integer number (4099002231).

Almost surely, 2^13663340765 is an apocalyptic number.

It is an amenable number.

13663340765 is a deficient number, since it is larger than the sum of its proper divisors (2732668159).

13663340765 is an equidigital number, since it uses as much as digits as its factorization.

13663340765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732668158.

The product of its (nonzero) digits is 816480, while the sum is 44.

The spelling of 13663340765 in words is "thirteen billion, six hundred sixty-three million, three hundred forty thousand, seven hundred sixty-five".