12666413533 has 4 divisors (see below), whose sum is σ = 13411496700. Its totient is φ = 11921330368.

The previous prime is 12666413531. The next prime is 12666413569. The reversal of 12666413533 is 33531466621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33531466621 = 17 ⋅1972439213.

It can be written as a sum of positive squares in 2 ways, for example, as 8061705369 + 4604708164 = 89787^2 + 67858^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666413533 - 2¹ = 12666413531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666413531) 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, 372541558 + ... + 372541591.

It is an arithmetic number, because the mean of its divisors is an integer number (3352874175).

Almost surely, 2^12666413533 is an apocalyptic number.

It is an amenable number.

12666413533 is a deficient number, since it is larger than the sum of its proper divisors (745083167).

12666413533 is an equidigital number, since it uses as much as digits as its factorization.

12666413533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745083166.

The product of its digits is 233280, while the sum is 40.

The spelling of 12666413533 in words is "twelve billion, six hundred sixty-six million, four hundred thirteen thousand, five hundred thirty-three".