27771248651 has 2 divisors, whose sum is σ = 27771248652. Its totient is φ = 27771248650.

The previous prime is 27771248641. The next prime is 27771248669. The reversal of 27771248651 is 15684217772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27771248651 - 2¹⁴ = 27771232267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27771248651.

It is not a weakly prime, because it can be changed into another prime (27771248621) 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, 13885624325 + 13885624326.

It is an arithmetic number, because the mean of its divisors is an integer number (13885624326).

Almost surely, 2^27771248651 is an apocalyptic number.

27771248651 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771248651 is an equidigital number, since it uses as much as digits as its factorization.

27771248651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1317120, while the sum is 50.

The spelling of 27771248651 in words is "twenty-seven billion, seven hundred seventy-one million, two hundred forty-eight thousand, six hundred fifty-one".