27573088661 has 2 divisors, whose sum is σ = 27573088662. Its totient is φ = 27573088660.

The previous prime is 27573088633. The next prime is 27573088687. The reversal of 27573088661 is 16688037572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19236303025 + 8336785636 = 138695^2 + 91306^2 .

It is a cyclic number.

It is not a de Polignac number, because 27573088661 - 2¹⁸ = 27572826517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27573088061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13786544330 + 13786544331.

It is an arithmetic number, because the mean of its divisors is an integer number (13786544331).

Almost surely, 2^27573088661 is an apocalyptic number.

It is an amenable number.

27573088661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27573088661 is an equidigital number, since it uses as much as digits as its factorization.

27573088661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 27573088661 in words is "twenty-seven billion, five hundred seventy-three million, eighty-eight thousand, six hundred sixty-one".