27775050557 has 2 divisors, whose sum is σ = 27775050558. Its totient is φ = 27775050556.

The previous prime is 27775050509. The next prime is 27775050559. The reversal of 27775050557 is 75505057772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25171091716 + 2603958841 = 158654^2 + 51029^2 .

It is a cyclic number.

It is not a de Polignac number, because 27775050557 - 2²⁴ = 27758273341 is a prime.

Together with 27775050559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27775050559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887525278 + 13887525279.

It is an arithmetic number, because the mean of its divisors is an integer number (13887525279).

Almost surely, 2^27775050557 is an apocalyptic number.

It is an amenable number.

27775050557 is a deficient number, since it is larger than the sum of its proper divisors (1).

27775050557 is an equidigital number, since it uses as much as digits as its factorization.

27775050557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3001250, while the sum is 50.

The spelling of 27775050557 in words is "twenty-seven billion, seven hundred seventy-five million, fifty thousand, five hundred fifty-seven".