27747725897 has 2 divisors, whose sum is σ = 27747725898. Its totient is φ = 27747725896.

The previous prime is 27747725833. The next prime is 27747725899. The reversal of 27747725897 is 79852774772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17631590656 + 10116135241 = 132784^2 + 100579^2 .

It is a cyclic number.

It is not a de Polignac number, because 27747725897 - 2⁶ = 27747725833 is a prime.

Together with 27747725899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27747725899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13873862948 + 13873862949.

It is an arithmetic number, because the mean of its divisors is an integer number (13873862949).

Almost surely, 2^27747725897 is an apocalyptic number.

It is an amenable number.

27747725897 is a deficient number, since it is larger than the sum of its proper divisors (1).

27747725897 is an equidigital number, since it uses as much as digits as its factorization.

27747725897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96808320, while the sum is 65.

The spelling of 27747725897 in words is "twenty-seven billion, seven hundred forty-seven million, seven hundred twenty-five thousand, eight hundred ninety-seven".