12660277243949 has 2 divisors, whose sum is σ = 12660277243950. Its totient is φ = 12660277243948.

The previous prime is 12660277243931. The next prime is 12660277243963. The reversal of 12660277243949 is 94934277206621.

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., 10770985758724 + 1889291485225 = 3281918^2 + 1374515^2 .

It is a cyclic number.

It is not a de Polignac number, because 12660277243949 - 2²⁰ = 12660276195373 is a prime.

It is a super-2 number, since 2×12660277243949² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12660277243891 and 12660277243900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12660277243049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330138621974 + 6330138621975.

It is an arithmetic number, because the mean of its divisors is an integer number (6330138621975).

Almost surely, 2^{12660277243949} is an apocalyptic number.

It is an amenable number.

12660277243949 is a deficient number, since it is larger than the sum of its proper divisors (1).

12660277243949 is an equidigital number, since it uses as much as digits as its factorization.

12660277243949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54867456, while the sum is 62.

The spelling of 12660277243949 in words is "twelve trillion, six hundred sixty billion, two hundred seventy-seven million, two hundred forty-three thousand, nine hundred forty-nine".