13861397857 has 2 divisors, whose sum is σ = 13861397858. Its totient is φ = 13861397856.

The previous prime is 13861397839. The next prime is 13861397881. The reversal of 13861397857 is 75879316831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12347876641 + 1513521216 = 111121^2 + 38904^2 .

It is an emirp because it is prime and its reverse (75879316831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13861397857 is a prime.

It is not a weakly prime, because it can be changed into another prime (13861397897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6930698928 + 6930698929.

It is an arithmetic number, because the mean of its divisors is an integer number (6930698929).

Almost surely, 2^13861397857 is an apocalyptic number.

It is an amenable number.

13861397857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13861397857 is an equidigital number, since it uses as much as digits as its factorization.

13861397857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 58.

The spelling of 13861397857 in words is "thirteen billion, eight hundred sixty-one million, three hundred ninety-seven thousand, eight hundred fifty-seven".