27907571691 has 12 divisors (see below), whose sum is σ = 40710056400. Its totient is φ = 18420838800.

The previous prime is 27907571633. The next prime is 27907571701. The reversal of 27907571691 is 19617570972.

It is a happy number.

27907571691 is a `hidden beast` number, since 2 + 7 + 9 + 0 + 7 + 571 + 69 + 1 = 666.

It is not a de Polignac number, because 27907571691 - 2⁷ = 27907571563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27907571891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15349791 + ... + 15351608.

It is an arithmetic number, because the mean of its divisors is an integer number (3392504700).

Almost surely, 2^27907571691 is an apocalyptic number.

27907571691 is a deficient number, since it is larger than the sum of its proper divisors (12802484709).

27907571691 is a wasteful number, since it uses less digits than its factorization.

27907571691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30701506 (or 30701503 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 54.

The spelling of 27907571691 in words is "twenty-seven billion, nine hundred seven million, five hundred seventy-one thousand, six hundred ninety-one".