27781870279 has 2 divisors, whose sum is σ = 27781870280. Its totient is φ = 27781870278.

The previous prime is 27781870247. The next prime is 27781870289. The reversal of 27781870279 is 97207818772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27781870279 - 2⁵ = 27781870247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27781870289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890935139 + 13890935140.

It is an arithmetic number, because the mean of its divisors is an integer number (13890935140).

Almost surely, 2^27781870279 is an apocalyptic number.

27781870279 is a deficient number, since it is larger than the sum of its proper divisors (1).

27781870279 is an equidigital number, since it uses as much as digits as its factorization.

27781870279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5531904, while the sum is 58.

The spelling of 27781870279 in words is "twenty-seven billion, seven hundred eighty-one million, eight hundred seventy thousand, two hundred seventy-nine".