13823566665 has 16 divisors (see below), whose sum is σ = 22131508608. Its totient is φ = 7367968256.

The previous prime is 13823566663. The next prime is 13823566693. The reversal of 13823566665 is 56666532831.

It is a cyclic number.

It is not a de Polignac number, because 13823566665 - 2¹ = 13823566663 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13823566661) 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, 262632 + ... + 310841.

It is an arithmetic number, because the mean of its divisors is an integer number (1383219288).

Almost surely, 2^13823566665 is an apocalyptic number.

13823566665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13823566665 is a deficient number, since it is larger than the sum of its proper divisors (8307941943).

13823566665 is a wasteful number, since it uses less digits than its factorization.

13823566665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575088.

The product of its digits is 4665600, while the sum is 51.

The spelling of 13823566665 in words is "thirteen billion, eight hundred twenty-three million, five hundred sixty-six thousand, six hundred sixty-five".