27636207661 has 2 divisors, whose sum is σ = 27636207662. Its totient is φ = 27636207660.

The previous prime is 27636207569. The next prime is 27636207707. The reversal of 27636207661 is 16670263672.

It is an a-pointer prime, because the next prime (27636207707) can be obtained adding 27636207661 to its sum of digits (46).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14491585161 + 13144622500 = 120381^2 + 114650^2 .

It is a cyclic number.

It is not a de Polignac number, because 27636207661 - 2⁹ = 27636207149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27636207061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13818103830 + 13818103831.

It is an arithmetic number, because the mean of its divisors is an integer number (13818103831).

Almost surely, 2^27636207661 is an apocalyptic number.

It is an amenable number.

27636207661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27636207661 is an equidigital number, since it uses as much as digits as its factorization.

27636207661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 46.

The spelling of 27636207661 in words is "twenty-seven billion, six hundred thirty-six million, two hundred seven thousand, six hundred sixty-one".