13981859065 has 4 divisors (see below), whose sum is σ = 16778230884. Its totient is φ = 11185487248.

The previous prime is 13981859063. The next prime is 13981859077. The reversal of 13981859065 is 56095818931.

13981859065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6526054656 + 7455804409 = 80784^2 + 86347^2 .

It is a cyclic number.

It is not a de Polignac number, because 13981859065 - 2¹ = 13981859063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13981858997 and 13981859015.

It is not an unprimeable number, because it can be changed into a prime (13981859063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1398185902 + ... + 1398185911.

It is an arithmetic number, because the mean of its divisors is an integer number (4194557721).

Almost surely, 2^13981859065 is an apocalyptic number.

It is an amenable number.

13981859065 is a deficient number, since it is larger than the sum of its proper divisors (2796371819).

13981859065 is an equidigital number, since it uses as much as digits as its factorization.

13981859065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796371818.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 13981859065 in words is "thirteen billion, nine hundred eighty-one million, eight hundred fifty-nine thousand, sixty-five".