12256720235261 has 2 divisors, whose sum is σ = 12256720235262. Its totient is φ = 12256720235260.

The previous prime is 12256720235219. The next prime is 12256720235273. The reversal of 12256720235261 is 16253202765221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12243490864900 + 13229370361 = 3499070^2 + 115019^2 .

It is a cyclic number.

It is not a de Polignac number, because 12256720235261 - 2³⁴ = 12239540366077 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 (12256720235861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6128360117630 + 6128360117631.

It is an arithmetic number, because the mean of its divisors is an integer number (6128360117631).

Almost surely, 2^{12256720235261} is an apocalyptic number.

It is an amenable number.

12256720235261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12256720235261 is an equidigital number, since it uses as much as digits as its factorization.

12256720235261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 12256720235261 in words is "twelve trillion, two hundred fifty-six billion, seven hundred twenty million, two hundred thirty-five thousand, two hundred sixty-one".