12205652777 has 2 divisors, whose sum is σ = 12205652778. Its totient is φ = 12205652776.

The previous prime is 12205652761. The next prime is 12205652783. The reversal of 12205652777 is 77725650221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10138677481 + 2066975296 = 100691^2 + 45464^2 .

It is an emirp because it is prime and its reverse (77725650221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12205652777 - 2⁴ = 12205652761 is a prime.

It is not a weakly prime, because it can be changed into another prime (12205652737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6102826388 + 6102826389.

It is an arithmetic number, because the mean of its divisors is an integer number (6102826389).

Almost surely, 2^12205652777 is an apocalyptic number.

It is an amenable number.

12205652777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12205652777 is an equidigital number, since it uses as much as digits as its factorization.

12205652777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 411600, while the sum is 44.

The spelling of 12205652777 in words is "twelve billion, two hundred five million, six hundred fifty-two thousand, seven hundred seventy-seven".