12655331261 has 2 divisors, whose sum is σ = 12655331262. Its totient is φ = 12655331260.

The previous prime is 12655331231. The next prime is 12655331317. The reversal of 12655331261 is 16213355621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9283322500 + 3372008761 = 96350^2 + 58069^2 .

It is an emirp because it is prime and its reverse (16213355621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12655331261 - 2²² = 12651136957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12655331231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327665630 + 6327665631.

It is an arithmetic number, because the mean of its divisors is an integer number (6327665631).

Almost surely, 2^12655331261 is an apocalyptic number.

It is an amenable number.

12655331261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12655331261 is an equidigital number, since it uses as much as digits as its factorization.

12655331261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

Adding to 12655331261 its reverse (16213355621), we get a palindrome (28868686882).

The spelling of 12655331261 in words is "twelve billion, six hundred fifty-five million, three hundred thirty-one thousand, two hundred sixty-one".