27691907880565 has 16 divisors (see below), whose sum is σ = 33281430484608. Its totient is φ = 22119437140416.

The previous prime is 27691907880521. The next prime is 27691907880589. The reversal of 27691907880565 is 56508870919672.

It is a cyclic number.

It is not a de Polignac number, because 27691907880565 - 2³⁷ = 27554468927093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46444879 + ... + 47037331.

It is an arithmetic number, because the mean of its divisors is an integer number (2080089405288).

Almost surely, 2^{27691907880565} is an apocalyptic number.

It is an amenable number.

27691907880565 is a deficient number, since it is larger than the sum of its proper divisors (5589522604043).

27691907880565 is a wasteful number, since it uses less digits than its factorization.

27691907880565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606828.

The product of its (nonzero) digits is 457228800, while the sum is 73.

The spelling of 27691907880565 in words is "twenty-seven trillion, six hundred ninety-one billion, nine hundred seven million, eight hundred eighty thousand, five hundred sixty-five".