13857843617 has 2 divisors, whose sum is σ = 13857843618. Its totient is φ = 13857843616.

The previous prime is 13857843589. The next prime is 13857843631. The reversal of 13857843617 is 71634875831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13857762961 + 80656 = 117719^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 13857843617 - 2¹² = 13857839521 is a prime.

It is not a weakly prime, because it can be changed into another prime (13857843647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6928921808 + 6928921809.

It is an arithmetic number, because the mean of its divisors is an integer number (6928921809).

Almost surely, 2^13857843617 is an apocalyptic number.

It is an amenable number.

13857843617 is a deficient number, since it is larger than the sum of its proper divisors (1).

13857843617 is an equidigital number, since it uses as much as digits as its factorization.

13857843617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 53.

The spelling of 13857843617 in words is "thirteen billion, eight hundred fifty-seven million, eight hundred forty-three thousand, six hundred seventeen".