27726817691 has 2 divisors, whose sum is σ = 27726817692. Its totient is φ = 27726817690.

The previous prime is 27726817649. The next prime is 27726817721. The reversal of 27726817691 is 19671862772.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27726817691 is a prime.

It is not a weakly prime, because it can be changed into another prime (27726817091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13863408845 + 13863408846.

It is an arithmetic number, because the mean of its divisors is an integer number (13863408846).

Almost surely, 2^27726817691 is an apocalyptic number.

27726817691 is a deficient number, since it is larger than the sum of its proper divisors (1).

27726817691 is an equidigital number, since it uses as much as digits as its factorization.

27726817691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 56.

The spelling of 27726817691 in words is "twenty-seven billion, seven hundred twenty-six million, eight hundred seventeen thousand, six hundred ninety-one".