13666037123 has 4 divisors (see below), whose sum is σ = 13666278648. Its totient is φ = 13665795600.

The previous prime is 13666037081. The next prime is 13666037141. The reversal of 13666037123 is 32173066631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32173066631 = 6997 ⋅4598123.

It is a cyclic number.

It is not a de Polignac number, because 13666037123 - 2³⁰ = 12592295299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13666037173) 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, 14948 + ... + 165998.

It is an arithmetic number, because the mean of its divisors is an integer number (3416569662).

Almost surely, 2^13666037123 is an apocalyptic number.

13666037123 is a deficient number, since it is larger than the sum of its proper divisors (241525).

13666037123 is an equidigital number, since it uses as much as digits as its factorization.

13666037123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241524.

The product of its (nonzero) digits is 81648, while the sum is 38.

The spelling of 13666037123 in words is "thirteen billion, six hundred sixty-six million, thirty-seven thousand, one hundred twenty-three".