13865803691 has 2 divisors, whose sum is σ = 13865803692. Its totient is φ = 13865803690.

The previous prime is 13865803673. The next prime is 13865803729. The reversal of 13865803691 is 19630856831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13865803691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (13865853691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6932901845 + 6932901846.

It is an arithmetic number, because the mean of its divisors is an integer number (6932901846).

Almost surely, 2^13865803691 is an apocalyptic number.

13865803691 is a deficient number, since it is larger than the sum of its proper divisors (1).

13865803691 is an equidigital number, since it uses as much as digits as its factorization.

13865803691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 13865803691 in words is "thirteen billion, eight hundred sixty-five million, eight hundred three thousand, six hundred ninety-one".