13634389897 has 4 divisors (see below), whose sum is σ = 13703600196. Its totient is φ = 13565179600.

The previous prime is 13634389891. The next prime is 13634389907. The reversal of 13634389897 is 79898343631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79898343631 = 82531 ⋅968101.

It can be written as a sum of positive squares in 2 ways, for example, as 7027301241 + 6607088656 = 83829^2 + 81284^2 .

It is a cyclic number.

It is not a de Polignac number, because 13634389897 - 2¹¹ = 13634387849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13634389891) 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, 34604854 + ... + 34605247.

It is an arithmetic number, because the mean of its divisors is an integer number (3425900049).

Almost surely, 2^13634389897 is an apocalyptic number.

It is an amenable number.

13634389897 is a deficient number, since it is larger than the sum of its proper divisors (69210299).

13634389897 is an equidigital number, since it uses as much as digits as its factorization.

13634389897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69210298.

The product of its digits is 23514624, while the sum is 61.

The spelling of 13634389897 in words is "thirteen billion, six hundred thirty-four million, three hundred eighty-nine thousand, eight hundred ninety-seven".