27528605561 has 2 divisors, whose sum is σ = 27528605562. Its totient is φ = 27528605560.

The previous prime is 27528605543. The next prime is 27528605567. The reversal of 27528605561 is 16550682572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24256193536 + 3272412025 = 155744^2 + 57205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27528605561 is a prime.

It is not a weakly prime, because it can be changed into another prime (27528605567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13764302780 + 13764302781.

It is an arithmetic number, because the mean of its divisors is an integer number (13764302781).

Almost surely, 2^27528605561 is an apocalyptic number.

It is an amenable number.

27528605561 is a deficient number, since it is larger than the sum of its proper divisors (1).

27528605561 is an equidigital number, since it uses as much as digits as its factorization.

27528605561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 27528605561 in words is "twenty-seven billion, five hundred twenty-eight million, six hundred five thousand, five hundred sixty-one".