27750748565 has 4 divisors (see below), whose sum is σ = 33300898284. Its totient is φ = 22200598848.

The previous prime is 27750748561. The next prime is 27750748577. The reversal of 27750748565 is 56584705772.

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 11835916849 + 15914831716 = 108793^2 + 126154^2 .

It is a cyclic number.

It is not a de Polignac number, because 27750748565 - 2² = 27750748561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27750748565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27750748561) 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 3 ways as a sum of consecutive naturals, for example, 2775074852 + ... + 2775074861.

It is an arithmetic number, because the mean of its divisors is an integer number (8325224571).

Almost surely, 2^27750748565 is an apocalyptic number.

It is an amenable number.

27750748565 is a deficient number, since it is larger than the sum of its proper divisors (5550149719).

27750748565 is an equidigital number, since it uses as much as digits as its factorization.

27750748565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550149718.

The product of its (nonzero) digits is 16464000, while the sum is 56.

The spelling of 27750748565 in words is "twenty-seven billion, seven hundred fifty million, seven hundred forty-eight thousand, five hundred sixty-five".