27771608647 has 16 divisors (see below), whose sum is σ = 29360747520. Its totient is φ = 26195421600.

The previous prime is 27771608617. The next prime is 27771608651. The reversal of 27771608647 is 74680617772.

It is not a de Polignac number, because 27771608647 - 2¹⁵ = 27771575879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27771608617) 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, 6515497 + ... + 6519757.

It is an arithmetic number, because the mean of its divisors is an integer number (1835046720).

Almost surely, 2^27771608647 is an apocalyptic number.

27771608647 is a deficient number, since it is larger than the sum of its proper divisors (1589138873).

27771608647 is a wasteful number, since it uses less digits than its factorization.

27771608647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694.

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 27771608647 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred eight thousand, six hundred forty-seven".