13857647857 has 4 divisors (see below), whose sum is σ = 13880108196. Its totient is φ = 13835187520.

The previous prime is 13857647827. The next prime is 13857647873. The reversal of 13857647857 is 75874675831.

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 7992538801 + 5865109056 = 89401^2 + 76584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13857647857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13857647795 and 13857647804.

It is not an unprimeable number, because it can be changed into a prime (13857647827) 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, 11229244 + ... + 11230477.

It is an arithmetic number, because the mean of its divisors is an integer number (3470027049).

Almost surely, 2^13857647857 is an apocalyptic number.

It is an amenable number.

13857647857 is a deficient number, since it is larger than the sum of its proper divisors (22460339).

13857647857 is an equidigital number, since it uses as much as digits as its factorization.

13857647857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22460338.

The product of its digits is 39513600, while the sum is 61.

The spelling of 13857647857 in words is "thirteen billion, eight hundred fifty-seven million, six hundred forty-seven thousand, eight hundred fifty-seven".