27665227901 has 2 divisors, whose sum is σ = 27665227902. Its totient is φ = 27665227900.

The previous prime is 27665227897. The next prime is 27665227927. The reversal of 27665227901 is 10972256672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20299125625 + 7366102276 = 142475^2 + 85826^2 .

It is a cyclic number.

It is not a de Polignac number, because 27665227901 - 2² = 27665227897 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27665227981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13832613950 + 13832613951.

It is an arithmetic number, because the mean of its divisors is an integer number (13832613951).

Almost surely, 2^27665227901 is an apocalyptic number.

It is an amenable number.

27665227901 is a deficient number, since it is larger than the sum of its proper divisors (1).

27665227901 is an equidigital number, since it uses as much as digits as its factorization.

27665227901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 27665227901 in words is "twenty-seven billion, six hundred sixty-five million, two hundred twenty-seven thousand, nine hundred one".