27771640207 has 2 divisors, whose sum is σ = 27771640208. Its totient is φ = 27771640206.

The previous prime is 27771640159. The next prime is 27771640213. The reversal of 27771640207 is 70204617772.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27771640207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27771640277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885820103 + 13885820104.

It is an arithmetic number, because the mean of its divisors is an integer number (13885820104).

Almost surely, 2^27771640207 is an apocalyptic number.

27771640207 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771640207 is an equidigital number, since it uses as much as digits as its factorization.

27771640207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230496, while the sum is 43.

The spelling of 27771640207 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred forty thousand, two hundred seven".