13968440661 has 16 divisors (see below), whose sum is σ = 22210689024. Its totient is φ = 7634923824.

The previous prime is 13968440657. The next prime is 13968440699. The reversal of 13968440661 is 16604486931.

13968440661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13968440661 - 2² = 13968440657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13968440661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13968442661) 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 15 ways as a sum of consecutive naturals, for example, 14459601 + ... + 14460566.

It is an arithmetic number, because the mean of its divisors is an integer number (1388168064).

Almost surely, 2^13968440661 is an apocalyptic number.

It is an amenable number.

13968440661 is a deficient number, since it is larger than the sum of its proper divisors (8242248363).

13968440661 is a wasteful number, since it uses less digits than its factorization.

13968440661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28920200.

The product of its (nonzero) digits is 746496, while the sum is 48.

The spelling of 13968440661 in words is "thirteen billion, nine hundred sixty-eight million, four hundred forty thousand, six hundred sixty-one".