27277643681 has 8 divisors (see below), whose sum is σ = 28039734120. Its totient is φ = 26516861568.

The previous prime is 27277643677. The next prime is 27277643711. The reversal of 27277643681 is 18634677272.

It can be written as a sum of positive squares in 4 ways, for example, as 189750625 + 27087893056 = 13775^2 + 164584^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27277643681 - 2² = 27277643677 is a prime.

It is a super-2 number, since 2×27277643681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27277643651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284726 + ... + 368271.

It is an arithmetic number, because the mean of its divisors is an integer number (3504966765).

Almost surely, 2^27277643681 is an apocalyptic number.

It is an amenable number.

27277643681 is a deficient number, since it is larger than the sum of its proper divisors (762090439).

27277643681 is a wasteful number, since it uses less digits than its factorization.

27277643681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654163.

The product of its digits is 4741632, while the sum is 53.

The spelling of 27277643681 in words is "twenty-seven billion, two hundred seventy-seven million, six hundred forty-three thousand, six hundred eighty-one".