27666617243 has 2 divisors, whose sum is σ = 27666617244. Its totient is φ = 27666617242.

The previous prime is 27666617197. The next prime is 27666617267. The reversal of 27666617243 is 34271666672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27666617243 - 2⁶ = 27666617179 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 27666617191 and 27666617200.

It is not a weakly prime, because it can be changed into another prime (27666617543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13833308621 + 13833308622.

It is an arithmetic number, because the mean of its divisors is an integer number (13833308622).

Almost surely, 2^27666617243 is an apocalyptic number.

27666617243 is a deficient number, since it is larger than the sum of its proper divisors (1).

27666617243 is an equidigital number, since it uses as much as digits as its factorization.

27666617243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 50.

The spelling of 27666617243 in words is "twenty-seven billion, six hundred sixty-six million, six hundred seventeen thousand, two hundred forty-three".