27555280505 has 4 divisors (see below), whose sum is σ = 33066336612. Its totient is φ = 22044224400.

The previous prime is 27555280471. The next prime is 27555280513. The reversal of 27555280505 is 50508255572.

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 8439729424 + 19115551081 = 91868^2 + 138259^2 .

It is a de Polignac number, because none of the positive numbers 2^k-27555280505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2755528046 + ... + 2755528055.

It is an arithmetic number, because the mean of its divisors is an integer number (8266584153).

Almost surely, 2^27555280505 is an apocalyptic number.

It is an amenable number.

27555280505 is a deficient number, since it is larger than the sum of its proper divisors (5511056107).

27555280505 is an equidigital number, since it uses as much as digits as its factorization.

27555280505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5511056106.

The product of its (nonzero) digits is 700000, while the sum is 44.

The spelling of 27555280505 in words is "twenty-seven billion, five hundred fifty-five million, two hundred eighty thousand, five hundred five".