27968645563 has 16 divisors (see below), whose sum is σ = 30806732800. Its totient is φ = 25290584640.

The previous prime is 27968645561. The next prime is 27968645581. The reversal of 27968645563 is 36554686972.

It is a cyclic number.

It is not a de Polignac number, because 27968645563 - 2¹ = 27968645561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27968645561) 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 in 15 ways as a sum of consecutive naturals, for example, 282243 + ... + 368236.

It is an arithmetic number, because the mean of its divisors is an integer number (1925420800).

Almost surely, 2^27968645563 is an apocalyptic number.

27968645563 is a deficient number, since it is larger than the sum of its proper divisors (2838087237).

27968645563 is a wasteful number, since it uses less digits than its factorization.

27968645563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650602.

The product of its digits is 65318400, while the sum is 61.

The spelling of 27968645563 in words is "twenty-seven billion, nine hundred sixty-eight million, six hundred forty-five thousand, five hundred sixty-three".