12665535273 has 40 divisors (see below), whose sum is σ = 19128485376. Its totient is φ = 8351229600.

The previous prime is 12665535257. The next prime is 12665535283. The reversal of 12665535273 is 37253556621.

12665535273 is a `hidden beast` number, since 1 + 26 + 6 + 553 + 5 + 2 + 73 = 666.

It is not a de Polignac number, because 12665535273 - 2⁴ = 12665535257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12665535283) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2797990 + ... + 2802512.

Almost surely, 2^12665535273 is an apocalyptic number.

It is an amenable number.

12665535273 is a deficient number, since it is larger than the sum of its proper divisors (6462950103).

12665535273 is a wasteful number, since it uses less digits than its factorization.

12665535273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4907 (or 4898 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 45.

The spelling of 12665535273 in words is "twelve billion, six hundred sixty-five million, five hundred thirty-five thousand, two hundred seventy-three".