13666744747 has 4 divisors (see below), whose sum is σ = 13681456920. Its totient is φ = 13652032576.

The previous prime is 13666744699. The next prime is 13666744753. The reversal of 13666744747 is 74744766631.

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 13666744747 - 2¹¹ = 13666742699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13666744547) 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, 7354693 + ... + 7356550.

It is an arithmetic number, because the mean of its divisors is an integer number (3420364230).

Almost surely, 2^13666744747 is an apocalyptic number.

13666744747 is a deficient number, since it is larger than the sum of its proper divisors (14712173).

13666744747 is an equidigital number, since it uses as much as digits as its factorization.

13666744747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14712172.

The product of its digits is 14224896, while the sum is 55.

The spelling of 13666744747 in words is "thirteen billion, six hundred sixty-six million, seven hundred forty-four thousand, seven hundred forty-seven".