27786404398897 has 2 divisors, whose sum is σ = 27786404398898. Its totient is φ = 27786404398896.

The previous prime is 27786404398859. The next prime is 27786404398903. The reversal of 27786404398897 is 79889340468772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27596908732176 + 189495666721 = 5253276^2 + 435311^2 .

It is a cyclic number.

It is not a de Polignac number, because 27786404398897 - 2¹⁹ = 27786403874609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27786404398897.

It is not a weakly prime, because it can be changed into another prime (27786404398097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13893202199448 + 13893202199449.

It is an arithmetic number, because the mean of its divisors is an integer number (13893202199449).

Almost surely, 2^{27786404398897} is an apocalyptic number.

It is an amenable number.

27786404398897 is a deficient number, since it is larger than the sum of its proper divisors (1).

27786404398897 is an equidigital number, since it uses as much as digits as its factorization.

27786404398897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8193540096, while the sum is 82.

The spelling of 27786404398897 in words is "twenty-seven trillion, seven hundred eighty-six billion, four hundred four million, three hundred ninety-eight thousand, eight hundred ninety-seven".