27783807917 has 2 divisors, whose sum is σ = 27783807918. Its totient is φ = 27783807916.

The previous prime is 27783807911. The next prime is 27783807949. The reversal of 27783807917 is 71970838772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27642055081 + 141752836 = 166259^2 + 11906^2 .

It is a cyclic number.

It is not a de Polignac number, because 27783807917 - 2¹⁰ = 27783806893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27783807911) 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, 13891903958 + 13891903959.

It is an arithmetic number, because the mean of its divisors is an integer number (13891903959).

Almost surely, 2^27783807917 is an apocalyptic number.

It is an amenable number.

27783807917 is a deficient number, since it is larger than the sum of its proper divisors (1).

27783807917 is an equidigital number, since it uses as much as digits as its factorization.

27783807917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8297856, while the sum is 59.

The spelling of 27783807917 in words is "twenty-seven billion, seven hundred eighty-three million, eight hundred seven thousand, nine hundred seventeen".