13426506435565 has 16 divisors (see below), whose sum is σ = 16416639882288. Its totient is φ = 10538004345856.

The previous prime is 13426506435541. The next prime is 13426506435577. The reversal of 13426506435565 is 56553460562431.

It is a happy number.

13426506435565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 916894342116 + 12509612093449 = 957546^2 + 3536893^2 .

It is a cyclic number.

It is not a de Polignac number, because 13426506435565 - 2⁷ = 13426506435437 is a prime.

It is a super-2 number, since 2×13426506435565² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3965247 + ... + 6525043.

It is an arithmetic number, because the mean of its divisors is an integer number (1026039992643).

Almost surely, 2^{13426506435565} is an apocalyptic number.

It is an amenable number.

13426506435565 is a deficient number, since it is larger than the sum of its proper divisors (2990133446723).

13426506435565 is a wasteful number, since it uses less digits than its factorization.

13426506435565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579648.

The product of its (nonzero) digits is 38880000, while the sum is 55.

Adding to 13426506435565 its reverse (56553460562431), we get a palindrome (69979966997996).

The spelling of 13426506435565 in words is "thirteen trillion, four hundred twenty-six billion, five hundred six million, four hundred thirty-five thousand, five hundred sixty-five".