1268201636209 has 2 divisors, whose sum is σ = 1268201636210. Its totient is φ = 1268201636208.

The previous prime is 1268201636197. The next prime is 1268201636291. The reversal of 1268201636209 is 9026361028621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945373123809 + 322828512400 = 972303^2 + 568180^2 .

It is an emirp because it is prime and its reverse (9026361028621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1268201636209 - 2⁷ = 1268201636081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1268201636509) 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, 634100818104 + 634100818105.

It is an arithmetic number, because the mean of its divisors is an integer number (634100818105).

Almost surely, 2^{1268201636209} is an apocalyptic number.

It is an amenable number.

1268201636209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268201636209 is an equidigital number, since it uses as much as digits as its factorization.

1268201636209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 1268201636209 in words is "one trillion, two hundred sixty-eight billion, two hundred one million, six hundred thirty-six thousand, two hundred nine".