27666161271 has 48 divisors (see below), whose sum is σ = 48005028864. Its totient is φ = 15011390592.

The previous prime is 27666161251. The next prime is 27666161287. The reversal of 27666161271 is 17216166672.

It is not a de Polignac number, because 27666161271 - 2⁵ = 27666161239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27666161251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 128830 + ... + 268196.

It is an arithmetic number, because the mean of its divisors is an integer number (1000104768).

Almost surely, 2^27666161271 is an apocalyptic number.

27666161271 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

27666161271 is a deficient number, since it is larger than the sum of its proper divisors (20338867593).

27666161271 is a wasteful number, since it uses less digits than its factorization.

27666161271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139540 (or 139537 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 27666161271 in words is "twenty-seven billion, six hundred sixty-six million, one hundred sixty-one thousand, two hundred seventy-one".