13643426135665 has 4 divisors (see below), whose sum is σ = 16372111362804. Its totient is φ = 10914740908528.

The previous prime is 13643426135659. The next prime is 13643426135671. The reversal of 13643426135665 is 56653162434631.

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

It is an interprime number because it is at equal distance from previous prime (13643426135659) and next prime (13643426135671).

It can be written as a sum of positive squares in 2 ways, for example, as 10419674114304 + 3223752021361 = 3227952^2 + 1795481^2 .

It is a cyclic number.

It is not a de Polignac number, because 13643426135665 - 2⁹ = 13643426135153 is a prime.

It is a super-2 number, since 2×13643426135665² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1364342613562 + ... + 1364342613571.

It is an arithmetic number, because the mean of its divisors is an integer number (4093027840701).

Almost surely, 2^{13643426135665} is an apocalyptic number.

It is an amenable number.

13643426135665 is a deficient number, since it is larger than the sum of its proper divisors (2728685227139).

13643426135665 is an equidigital number, since it uses as much as digits as its factorization.

13643426135665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728685227138.

The product of its digits is 27993600, while the sum is 55.

The spelling of 13643426135665 in words is "thirteen trillion, six hundred forty-three billion, four hundred twenty-six million, one hundred thirty-five thousand, six hundred sixty-five".