27709866641 has 2 divisors, whose sum is σ = 27709866642. Its totient is φ = 27709866640.

The previous prime is 27709866637. The next prime is 27709866643. The reversal of 27709866641 is 14666890772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17843616400 + 9866250241 = 133580^2 + 99329^2 .

It is a cyclic number.

It is not a de Polignac number, because 27709866641 - 2² = 27709866637 is a prime.

Together with 27709866643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27709866643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13854933320 + 13854933321.

It is an arithmetic number, because the mean of its divisors is an integer number (13854933321).

Almost surely, 2^27709866641 is an apocalyptic number.

It is an amenable number.

27709866641 is a deficient number, since it is larger than the sum of its proper divisors (1).

27709866641 is an equidigital number, since it uses as much as digits as its factorization.

27709866641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 27709866641 in words is "twenty-seven billion, seven hundred nine million, eight hundred sixty-six thousand, six hundred forty-one".