27775065991 has 2 divisors, whose sum is σ = 27775065992. Its totient is φ = 27775065990.

The previous prime is 27775065961. The next prime is 27775066003. The reversal of 27775065991 is 19956057772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27775065991 - 2⁵ = 27775065959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27775065961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887532995 + 13887532996.

It is an arithmetic number, because the mean of its divisors is an integer number (13887532996).

Almost surely, 2^27775065991 is an apocalyptic number.

27775065991 is a deficient number, since it is larger than the sum of its proper divisors (1).

27775065991 is an equidigital number, since it uses as much as digits as its factorization.

27775065991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8334900, while the sum is 58.

The spelling of 27775065991 in words is "twenty-seven billion, seven hundred seventy-five million, sixty-five thousand, nine hundred ninety-one".