27556745563 has 2 divisors, whose sum is σ = 27556745564. Its totient is φ = 27556745562.

The previous prime is 27556745543. The next prime is 27556745597. The reversal of 27556745563 is 36554765572.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27556745563 is a prime.

It is not a weakly prime, because it can be changed into another prime (27556745543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13778372781 + 13778372782.

It is an arithmetic number, because the mean of its divisors is an integer number (13778372782).

Almost surely, 2^27556745563 is an apocalyptic number.

27556745563 is a deficient number, since it is larger than the sum of its proper divisors (1).

27556745563 is an equidigital number, since it uses as much as digits as its factorization.

27556745563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460000, while the sum is 55.

The spelling of 27556745563 in words is "twenty-seven billion, five hundred fifty-six million, seven hundred forty-five thousand, five hundred sixty-three".