12135253115561 has 2 divisors, whose sum is σ = 12135253115562. Its totient is φ = 12135253115560.

The previous prime is 12135253115477. The next prime is 12135253115599. The reversal of 12135253115561 is 16551135253121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9143027777536 + 2992225338025 = 3023744^2 + 1729805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12135253115561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12135253175561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6067626557780 + 6067626557781.

It is an arithmetic number, because the mean of its divisors is an integer number (6067626557781).

Almost surely, 2^{12135253115561} is an apocalyptic number.

It is an amenable number.

12135253115561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12135253115561 is an equidigital number, since it uses as much as digits as its factorization.

12135253115561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135000, while the sum is 41.

Adding to 12135253115561 its reverse (16551135253121), we get a palindrome (28686388368682).

The spelling of 12135253115561 in words is "twelve trillion, one hundred thirty-five billion, two hundred fifty-three million, one hundred fifteen thousand, five hundred sixty-one".