13865663887 has 2 divisors, whose sum is σ = 13865663888. Its totient is φ = 13865663886.

The previous prime is 13865663759. The next prime is 13865663893. The reversal of 13865663887 is 78836656831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13865663887 - 2⁷ = 13865663759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13865669887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6932831943 + 6932831944.

It is an arithmetic number, because the mean of its divisors is an integer number (6932831944).

Almost surely, 2^13865663887 is an apocalyptic number.

13865663887 is a deficient number, since it is larger than the sum of its proper divisors (1).

13865663887 is an equidigital number, since it uses as much as digits as its factorization.

13865663887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 61.

The spelling of 13865663887 in words is "thirteen billion, eight hundred sixty-five million, six hundred sixty-three thousand, eight hundred eighty-seven".