27686166427 has 4 divisors (see below), whose sum is σ = 27690988000. Its totient is φ = 27681344856.

The previous prime is 27686166421. The next prime is 27686166439. The reversal of 27686166427 is 72466168672.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27686166427 - 2¹¹ = 27686164379 is a prime.

It is a super-2 number, since 2×27686166427² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27686166421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2402163 + ... + 2413660.

It is an arithmetic number, because the mean of its divisors is an integer number (6922747000).

Almost surely, 2^27686166427 is an apocalyptic number.

27686166427 is a deficient number, since it is larger than the sum of its proper divisors (4821573).

27686166427 is an equidigital number, since it uses as much as digits as its factorization.

27686166427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4821572.

The product of its digits is 8128512, while the sum is 55.

The spelling of 27686166427 in words is "twenty-seven billion, six hundred eighty-six million, one hundred sixty-six thousand, four hundred twenty-seven".