27959691591 has 32 divisors (see below), whose sum is σ = 44632728000. Its totient is φ = 17196447744.

The previous prime is 27959691589. The next prime is 27959691607. The reversal of 27959691591 is 19519695972.

27959691591 is a `hidden beast` number, since 27 + 9 + 596 + 9 + 15 + 9 + 1 = 666.

It is not a de Polignac number, because 27959691591 - 2¹ = 27959691589 is a prime.

It is a super-4 number, since 4×27959691591⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27959691511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 641955 + ... + 684123.

It is an arithmetic number, because the mean of its divisors is an integer number (1394772750).

Almost surely, 2^27959691591 is an apocalyptic number.

27959691591 is a deficient number, since it is larger than the sum of its proper divisors (16673036409).

27959691591 is a wasteful number, since it uses less digits than its factorization.

27959691591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44080 (or 44074 counting only the distinct ones).

The product of its digits is 13778100, while the sum is 63.

The spelling of 27959691591 in words is "twenty-seven billion, nine hundred fifty-nine million, six hundred ninety-one thousand, five hundred ninety-one".