13666051687 has 4 divisors (see below), whose sum is σ = 14106892096. Its totient is φ = 13225211280.

The previous prime is 13666051673. The next prime is 13666051697. The reversal of 13666051687 is 78615066631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13666051687 - 2⁷ = 13666051559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13666051687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13666051667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220420158 + ... + 220420219.

It is an arithmetic number, because the mean of its divisors is an integer number (3526723024).

Almost surely, 2^13666051687 is an apocalyptic number.

13666051687 is a deficient number, since it is larger than the sum of its proper divisors (440840409).

13666051687 is an equidigital number, since it uses as much as digits as its factorization.

13666051687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440840408.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 13666051687 in words is "thirteen billion, six hundred sixty-six million, fifty-one thousand, six hundred eighty-seven".