13634811243 has 20 divisors (see below), whose sum is σ = 20409593688. Its totient is φ = 9071334720.

The previous prime is 13634811221. The next prime is 13634811247. The reversal of 13634811243 is 34211843631.

13634811243 is a `hidden beast` number, since 1 + 3 + 634 + 8 + 1 + 12 + 4 + 3 = 666.

It is not a de Polignac number, because 13634811243 - 2⁹ = 13634810731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13634811198 and 13634811207.

It is not an unprimeable number, because it can be changed into a prime (13634811247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 131646 + ... + 211187.

Almost surely, 2^13634811243 is an apocalyptic number.

13634811243 is a deficient number, since it is larger than the sum of its proper divisors (6774782445).

13634811243 is an equidigital number, since it uses as much as digits as its factorization.

13634811243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343336 (or 343327 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 13634811243 in words is "thirteen billion, six hundred thirty-four million, eight hundred eleven thousand, two hundred forty-three".