13440423065 has 4 divisors (see below), whose sum is σ = 16128507684. Its totient is φ = 10752338448.

The previous prime is 13440423041. The next prime is 13440423067. The reversal of 13440423065 is 56032404431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56032404431 = 23 ⋅2436191497.

It can be written as a sum of positive squares in 2 ways, for example, as 8612396809 + 4828026256 = 92803^2 + 69484^2 .

It is a cyclic number.

It is not a de Polignac number, because 13440423065 - 2¹⁶ = 13440357529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13440423067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344042302 + ... + 1344042311.

It is an arithmetic number, because the mean of its divisors is an integer number (4032126921).

Almost surely, 2^13440423065 is an apocalyptic number.

It is an amenable number.

13440423065 is a deficient number, since it is larger than the sum of its proper divisors (2688084619).

13440423065 is an equidigital number, since it uses as much as digits as its factorization.

13440423065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688084618.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 13440423065 its reverse (56032404431), we get a palindrome (69472827496).

The spelling of 13440423065 in words is "thirteen billion, four hundred forty million, four hundred twenty-three thousand, sixty-five".