12256665761 has 2 divisors, whose sum is σ = 12256665762. Its totient is φ = 12256665760.

The previous prime is 12256665721. The next prime is 12256665793. The reversal of 12256665761 is 16756665221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10595614225 + 1661051536 = 102935^2 + 40756^2 .

It is an emirp because it is prime and its reverse (16756665221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12256665761 - 2¹⁰ = 12256664737 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 (12256665721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6128332880 + 6128332881.

It is an arithmetic number, because the mean of its divisors is an integer number (6128332881).

Almost surely, 2^12256665761 is an apocalyptic number.

It is an amenable number.

12256665761 is a deficient number, since it is larger than the sum of its proper divisors (1).

12256665761 is an equidigital number, since it uses as much as digits as its factorization.

12256665761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The spelling of 12256665761 in words is "twelve billion, two hundred fifty-six million, six hundred sixty-five thousand, seven hundred sixty-one".