27693758857 has 2 divisors, whose sum is σ = 27693758858. Its totient is φ = 27693758856.

The previous prime is 27693758831. The next prime is 27693758861. The reversal of 27693758857 is 75885739672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24518549056 + 3175209801 = 156584^2 + 56349^2 .

It is a cyclic number.

It is not a de Polignac number, because 27693758857 - 2²³ = 27685370249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27693758792 and 27693758801.

It is not a weakly prime, because it can be changed into another prime (27693758357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13846879428 + 13846879429.

It is an arithmetic number, because the mean of its divisors is an integer number (13846879429).

Almost surely, 2^27693758857 is an apocalyptic number.

It is an amenable number.

27693758857 is a deficient number, since it is larger than the sum of its proper divisors (1).

27693758857 is an equidigital number, since it uses as much as digits as its factorization.

27693758857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 177811200, while the sum is 67.

The spelling of 27693758857 in words is "twenty-seven billion, six hundred ninety-three million, seven hundred fifty-eight thousand, eight hundred fifty-seven".