27729977591 has 2 divisors, whose sum is σ = 27729977592. Its totient is φ = 27729977590.

The previous prime is 27729977563. The next prime is 27729977593. The reversal of 27729977591 is 19577992772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27729977591 - 2¹⁰ = 27729976567 is a prime.

It is a Sophie Germain prime.

Together with 27729977593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27729977593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864988795 + 13864988796.

It is an arithmetic number, because the mean of its divisors is an integer number (13864988796).

Almost surely, 2^27729977591 is an apocalyptic number.

27729977591 is a deficient number, since it is larger than the sum of its proper divisors (1).

27729977591 is an equidigital number, since it uses as much as digits as its factorization.

27729977591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35006580, while the sum is 65.

The spelling of 27729977591 in words is "twenty-seven billion, seven hundred twenty-nine million, nine hundred seventy-seven thousand, five hundred ninety-one".