12665233133521 has 2 divisors, whose sum is σ = 12665233133522. Its totient is φ = 12665233133520.

The previous prime is 12665233133513. The next prime is 12665233133549. The reversal of 12665233133521 is 12533133256621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8329509715921 + 4335723417600 = 2886089^2 + 2082240^2 .

It is a cyclic number.

It is not a de Polignac number, because 12665233133521 - 2³ = 12665233133513 is a prime.

It is a super-2 number, since 2×12665233133521² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12665233163521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332616566760 + 6332616566761.

It is an arithmetic number, because the mean of its divisors is an integer number (6332616566761).

Almost surely, 2^{12665233133521} is an apocalyptic number.

It is an amenable number.

12665233133521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12665233133521 is an equidigital number, since it uses as much as digits as its factorization.

12665233133521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 43.

It can be divided in two parts, 1266523 and 3133521, that added together give a palindrome (4400044).

The spelling of 12665233133521 in words is "twelve trillion, six hundred sixty-five billion, two hundred thirty-three million, one hundred thirty-three thousand, five hundred twenty-one".