27983665866209 has 2 divisors, whose sum is σ = 27983665866210. Its totient is φ = 27983665866208.

The previous prime is 27983665866137. The next prime is 27983665866311. The reversal of 27983665866209 is 90266856638972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27851246295184 + 132419571025 = 5277428^2 + 363895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27983665866209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27983665866209.

It is not a weakly prime, because it can be changed into another prime (27983665836209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13991832933104 + 13991832933105.

It is an arithmetic number, because the mean of its divisors is an integer number (13991832933105).

Almost surely, 2^{27983665866209} is an apocalyptic number.

It is an amenable number.

27983665866209 is a deficient number, since it is larger than the sum of its proper divisors (1).

27983665866209 is an equidigital number, since it uses as much as digits as its factorization.

27983665866209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2821754880, while the sum is 77.

The spelling of 27983665866209 in words is "twenty-seven trillion, nine hundred eighty-three billion, six hundred sixty-five million, eight hundred sixty-six thousand, two hundred nine".