27806581165 has 16 divisors (see below), whose sum is σ = 38542599360. Its totient is φ = 19033381120.

The previous prime is 27806581157. The next prime is 27806581217. The reversal of 27806581165 is 56118560872.

It is not a de Polignac number, because 27806581165 - 2³ = 27806581157 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 14868895 + ... + 14870764.

It is an arithmetic number, because the mean of its divisors is an integer number (2408912460).

Almost surely, 2^27806581165 is an apocalyptic number.

It is an amenable number.

27806581165 is a deficient number, since it is larger than the sum of its proper divisors (10736018195).

27806581165 is a wasteful number, since it uses less digits than its factorization.

27806581165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29739692.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 27806581165 in words is "twenty-seven billion, eight hundred six million, five hundred eighty-one thousand, one hundred sixty-five".