12135253115525 has 12 divisors (see below), whose sum is σ = 15701962292832. Its totient is φ = 9286106731440.

The previous prime is 12135253115477. The next prime is 12135253115561. The reversal of 12135253115525 is 52551135253121.

It is not a de Polignac number, because 12135253115525 - 2¹⁶ = 12135253049989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10552393439 + ... + 10552394588.

It is an arithmetic number, because the mean of its divisors is an integer number (1308496857736).

Almost surely, 2^{12135253115525} is an apocalyptic number.

It is an amenable number.

12135253115525 is a deficient number, since it is larger than the sum of its proper divisors (3566709177307).

12135253115525 is a wasteful number, since it uses less digits than its factorization.

12135253115525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21104788060 (or 21104788055 counting only the distinct ones).

The product of its digits is 225000, while the sum is 41.

Adding to 12135253115525 its reverse (52551135253121), we get a palindrome (64686388368646).

The spelling of 12135253115525 in words is "twelve trillion, one hundred thirty-five billion, two hundred fifty-three million, one hundred fifteen thousand, five hundred twenty-five".