13866638665 has 16 divisors (see below), whose sum is σ = 18155342016. Its totient is φ = 10083355200.

The previous prime is 13866638663. The next prime is 13866638671. The reversal of 13866638665 is 56683666831.

It is not a de Polignac number, because 13866638665 - 2¹ = 13866638663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13866638663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486139 + ... + 513871.

It is an arithmetic number, because the mean of its divisors is an integer number (1134708876).

Almost surely, 2^13866638665 is an apocalyptic number.

It is an amenable number.

13866638665 is a deficient number, since it is larger than the sum of its proper divisors (4288703351).

13866638665 is a wasteful number, since it uses less digits than its factorization.

13866638665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36840.

The product of its digits is 22394880, while the sum is 58.

The spelling of 13866638665 in words is "thirteen billion, eight hundred sixty-six million, six hundred thirty-eight thousand, six hundred sixty-five".