27865133689 has 4 divisors (see below), whose sum is σ = 27871168420. Its totient is φ = 27859098960.

The previous prime is 27865133629. The next prime is 27865133717. The reversal of 27865133689 is 98633156872.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18385190464 + 9479943225 = 135592^2 + 97365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27865133689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27865133629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3010434 + ... + 3019675.

It is an arithmetic number, because the mean of its divisors is an integer number (6967792105).

Almost surely, 2^27865133689 is an apocalyptic number.

It is an amenable number.

27865133689 is a deficient number, since it is larger than the sum of its proper divisors (6034731).

27865133689 is an equidigital number, since it uses as much as digits as its factorization.

27865133689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6034730.

The product of its digits is 13063680, while the sum is 58.

The spelling of 27865133689 in words is "twenty-seven billion, eight hundred sixty-five million, one hundred thirty-three thousand, six hundred eighty-nine".