27726661663 has 2 divisors, whose sum is σ = 27726661664. Its totient is φ = 27726661662.

The previous prime is 27726661661. The next prime is 27726661693. The reversal of 27726661663 is 36616662772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27726661663 - 2¹ = 27726661661 is a prime.

Together with 27726661661, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 27726661663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27726661661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13863330831 + 13863330832.

It is an arithmetic number, because the mean of its divisors is an integer number (13863330832).

Almost surely, 2^27726661663 is an apocalyptic number.

27726661663 is a deficient number, since it is larger than the sum of its proper divisors (1).

27726661663 is an equidigital number, since it uses as much as digits as its factorization.

27726661663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 52.

The spelling of 27726661663 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred sixty-one thousand, six hundred sixty-three".