13635136243 has 4 divisors (see below), whose sum is σ = 13638175488. Its totient is φ = 13632097000.

The previous prime is 13635136241. The next prime is 13635136247. The reversal of 13635136243 is 34263153631.

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

It is a cyclic number.

It is not a de Polignac number, because 13635136243 - 2¹ = 13635136241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13635136241) 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, 1512883 + ... + 1521868.

It is an arithmetic number, because the mean of its divisors is an integer number (3409543872).

Almost surely, 2^13635136243 is an apocalyptic number.

13635136243 is a deficient number, since it is larger than the sum of its proper divisors (3039245).

13635136243 is an equidigital number, since it uses as much as digits as its factorization.

13635136243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039244.

The product of its digits is 116640, while the sum is 37.

Adding to 13635136243 its reverse (34263153631), we get a palindrome (47898289874).

It can be divided in two parts, 13635 and 136243, that added together give a triangular number (149878 = T₅₄₇).

The spelling of 13635136243 in words is "thirteen billion, six hundred thirty-five million, one hundred thirty-six thousand, two hundred forty-three".