27775191760861 has 2 divisors, whose sum is σ = 27775191760862. Its totient is φ = 27775191760860.

The previous prime is 27775191760847. The next prime is 27775191760873. The reversal of 27775191760861 is 16806719157772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27624810676761 + 150381084100 = 5255931^2 + 387790^2 .

It is a cyclic number.

It is not a de Polignac number, because 27775191760861 - 2⁷ = 27775191760733 is a prime.

It is a super-2 number, since 2×27775191760861² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27775191764861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887595880430 + 13887595880431.

It is an arithmetic number, because the mean of its divisors is an integer number (13887595880431).

Almost surely, 2^{27775191760861} is an apocalyptic number.

It is an amenable number.

27775191760861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27775191760861 is an equidigital number, since it uses as much as digits as its factorization.

27775191760861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62233920, while the sum is 67.

The spelling of 27775191760861 in words is "twenty-seven trillion, seven hundred seventy-five billion, one hundred ninety-one million, seven hundred sixty thousand, eight hundred sixty-one".