27791713777 has 2 divisors, whose sum is σ = 27791713778. Its totient is φ = 27791713776.

The previous prime is 27791713771. The next prime is 27791713787. The reversal of 27791713777 is 77731719772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19305435136 + 8486278641 = 138944^2 + 92121^2 .

It is a cyclic number.

It is not a de Polignac number, because 27791713777 - 2²⁷ = 27657496049 is a prime.

It is not a weakly prime, because it can be changed into another prime (27791713771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13895856888 + 13895856889.

It is an arithmetic number, because the mean of its divisors is an integer number (13895856889).

Almost surely, 2^27791713777 is an apocalyptic number.

It is an amenable number.

27791713777 is a deficient number, since it is larger than the sum of its proper divisors (1).

27791713777 is an equidigital number, since it uses as much as digits as its factorization.

27791713777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6353046, while the sum is 58.

The spelling of 27791713777 in words is "twenty-seven billion, seven hundred ninety-one million, seven hundred thirteen thousand, seven hundred seventy-seven".