27747684689 has 2 divisors, whose sum is σ = 27747684690. Its totient is φ = 27747684688.

The previous prime is 27747684673. The next prime is 27747684707. The reversal of 27747684689 is 98648674772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26436158464 + 1311526225 = 162592^2 + 36215^2 .

It is a cyclic number.

It is not a de Polignac number, because 27747684689 - 2⁴ = 27747684673 is a prime.

It is not a weakly prime, because it can be changed into another prime (27747684659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13873842344 + 13873842345.

It is an arithmetic number, because the mean of its divisors is an integer number (13873842345).

Almost surely, 2^27747684689 is an apocalyptic number.

It is an amenable number.

27747684689 is a deficient number, since it is larger than the sum of its proper divisors (1).

27747684689 is an equidigital number, since it uses as much as digits as its factorization.

27747684689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 227598336, while the sum is 68.

The spelling of 27747684689 in words is "twenty-seven billion, seven hundred forty-seven million, six hundred eighty-four thousand, six hundred eighty-nine".