27656355205 has 4 divisors (see below), whose sum is σ = 33187626252. Its totient is φ = 22125084160.

The previous prime is 27656355187. The next prime is 27656355211. The reversal of 27656355205 is 50255365672.

It is a Cunningham number, because it is equal to 166302²+1.

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 9956447524 + 17699907681 = 99782^2 + 133041^2 .

It is not a de Polignac number, because 27656355205 - 2¹⁷ = 27656224133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765635516 + ... + 2765635525.

It is an arithmetic number, because the mean of its divisors is an integer number (8296906563).

Almost surely, 2^27656355205 is an apocalyptic number.

It is an amenable number.

27656355205 is a deficient number, since it is larger than the sum of its proper divisors (5531271047).

27656355205 is an equidigital number, since it uses as much as digits as its factorization.

27656355205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5531271046.

The product of its (nonzero) digits is 1890000, while the sum is 46.

The spelling of 27656355205 in words is "twenty-seven billion, six hundred fifty-six million, three hundred fifty-five thousand, two hundred five".