13889645689 has 8 divisors (see below), whose sum is σ = 13952108808. Its totient is φ = 13827300480.

The previous prime is 13889645681. The next prime is 13889645699. The reversal of 13889645689 is 98654698831.

It can be written as a sum of positive squares in 4 ways, for example, as 228010000 + 13661635689 = 15100^2 + 116883^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13889645689 - 2³ = 13889645681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13889645681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211029 + ... + 268909.

It is an arithmetic number, because the mean of its divisors is an integer number (1744013601).

Almost surely, 2^13889645689 is an apocalyptic number.

It is an amenable number.

13889645689 is a deficient number, since it is larger than the sum of its proper divisors (62463119).

13889645689 is an equidigital number, since it uses as much as digits as its factorization.

13889645689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58955.

The product of its digits is 89579520, while the sum is 67.

The spelling of 13889645689 in words is "thirteen billion, eight hundred eighty-nine million, six hundred forty-five thousand, six hundred eighty-nine".