13665843801 has 45 divisors (see below), whose sum is σ = 21144645093. Its totient is φ = 8795631240.

The previous prime is 13665843799. The next prime is 13665843809. The reversal of 13665843801 is 10834856631.

The square root of 13665843801 is 116901.

It is a perfect power (a square), and thus also a powerful number.

13665843801 is a `hidden beast` number, since 1 + 3 + 66 + 584 + 3 + 8 + 0 + 1 = 666.

13665843801 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 13665843801 - 2¹ = 13665843799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13665843809) 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 44 ways as a sum of consecutive naturals, for example, 32615170 + ... + 32615588.

Almost surely, 2^13665843801 is an apocalyptic number.

13665843801 is the 116901-st square number.

13665843801 is the 58451-st centered octagonal number.

It is an amenable number.

13665843801 is a deficient number, since it is larger than the sum of its proper divisors (7478801292).

13665843801 is an frugal number, since it uses more digits than its factorization.

13665843801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 13665843801 in words is "thirteen billion, six hundred sixty-five million, eight hundred forty-three thousand, eight hundred one".