27763813817 has 2 divisors, whose sum is σ = 27763813818. Its totient is φ = 27763813816.

The previous prime is 27763813811. The next prime is 27763813871. The reversal of 27763813817 is 71831836772.

Together with next prime (27763813871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25582083136 + 2181730681 = 159944^2 + 46709^2 .

It is a cyclic number.

It is not a de Polignac number, because 27763813817 - 2¹⁰ = 27763812793 is a prime.

It is not a weakly prime, because it can be changed into another prime (27763813811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13881906908 + 13881906909.

It is an arithmetic number, because the mean of its divisors is an integer number (13881906909).

Almost surely, 2^27763813817 is an apocalyptic number.

It is an amenable number.

27763813817 is a deficient number, since it is larger than the sum of its proper divisors (1).

27763813817 is an equidigital number, since it uses as much as digits as its factorization.

27763813817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 53.

The spelling of 27763813817 in words is "twenty-seven billion, seven hundred sixty-three million, eight hundred thirteen thousand, eight hundred seventeen".