27775732861 has 2 divisors, whose sum is σ = 27775732862. Its totient is φ = 27775732860.

The previous prime is 27775732819. The next prime is 27775732867. The reversal of 27775732861 is 16823757772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26606503225 + 1169229636 = 163115^2 + 34194^2 .

It is a cyclic number.

It is not a de Polignac number, because 27775732861 - 2²⁷ = 27641515133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27775732867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887866430 + 13887866431.

It is an arithmetic number, because the mean of its divisors is an integer number (13887866431).

Almost surely, 2^27775732861 is an apocalyptic number.

It is an amenable number.

27775732861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27775732861 is an equidigital number, since it uses as much as digits as its factorization.

27775732861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6914880, while the sum is 55.

The spelling of 27775732861 in words is "twenty-seven billion, seven hundred seventy-five million, seven hundred thirty-two thousand, eight hundred sixty-one".