27891760992209 has 2 divisors, whose sum is σ = 27891760992210. Its totient is φ = 27891760992208.

The previous prime is 27891760992187. The next prime is 27891760992257. The reversal of 27891760992209 is 90229906719872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19707029347600 + 8184731644609 = 4439260^2 + 2860897^2 .

It is a cyclic number.

It is not a de Polignac number, because 27891760992209 - 2⁴⁴ = 10299574947793 is a prime.

It is not a weakly prime, because it can be changed into another prime (27891760992289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945880496104 + 13945880496105.

It is an arithmetic number, because the mean of its divisors is an integer number (13945880496105).

Almost surely, 2^{27891760992209} is an apocalyptic number.

It is an amenable number.

27891760992209 is a deficient number, since it is larger than the sum of its proper divisors (1).

27891760992209 is an equidigital number, since it uses as much as digits as its factorization.

27891760992209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123451776, while the sum is 71.

The spelling of 27891760992209 in words is "twenty-seven trillion, eight hundred ninety-one billion, seven hundred sixty million, nine hundred ninety-two thousand, two hundred nine".