27591997805 has 16 divisors (see below), whose sum is σ = 33555532800. Its totient is φ = 21777275520.

The previous prime is 27591997799. The next prime is 27591997843. The reversal of 27591997805 is 50879919572.

It is not a de Polignac number, because 27591997805 - 2⁴ = 27591997789 is a prime.

It is a super-2 number, since 2×27591997805² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495356 + ... + 548234.

It is an arithmetic number, because the mean of its divisors is an integer number (2097220800).

Almost surely, 2^27591997805 is an apocalyptic number.

It is an amenable number.

27591997805 is a deficient number, since it is larger than the sum of its proper divisors (5963534995).

27591997805 is a wasteful number, since it uses less digits than its factorization.

27591997805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54284.

The product of its (nonzero) digits is 14288400, while the sum is 62.

The spelling of 27591997805 in words is "twenty-seven billion, five hundred ninety-one million, nine hundred ninety-seven thousand, eight hundred five".