13161315165533 has 4 divisors (see below), whose sum is σ = 13257383159580. Its totient is φ = 13065247171488.

The previous prime is 13161315165521. The next prime is 13161315165571. The reversal of 13161315165533 is 33556151316131.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8188651542724 + 4972663622809 = 2861582^2 + 2229947^2 .

It is a cyclic number.

It is not a de Polignac number, because 13161315165533 - 2¹² = 13161315161437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13161315164533) 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, 48033996818 + ... + 48033997091.

It is an arithmetic number, because the mean of its divisors is an integer number (3314345789895).

Almost surely, 2^{13161315165533} is an apocalyptic number.

It is an amenable number.

13161315165533 is a deficient number, since it is larger than the sum of its proper divisors (96067994047).

13161315165533 is an equidigital number, since it uses as much as digits as its factorization.

13161315165533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96067994046.

The product of its digits is 364500, while the sum is 44.

The spelling of 13161315165533 in words is "thirteen trillion, one hundred sixty-one billion, three hundred fifteen million, one hundred sixty-five thousand, five hundred thirty-three".