27205715849 has 4 divisors (see below), whose sum is σ = 29298463236. Its totient is φ = 25112968464.

The previous prime is 27205715843. The next prime is 27205715851. The reversal of 27205715849 is 94851750272.

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 7622512249 + 19583203600 = 87307^2 + 139940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27205715849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27205715797 and 27205715806.

It is not an unprimeable number, because it can be changed into a prime (27205715843) 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, 1046373674 + ... + 1046373699.

It is an arithmetic number, because the mean of its divisors is an integer number (7324615809).

Almost surely, 2^27205715849 is an apocalyptic number.

It is an amenable number.

27205715849 is a deficient number, since it is larger than the sum of its proper divisors (2092747387).

27205715849 is a wasteful number, since it uses less digits than its factorization.

27205715849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092747386.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 27205715849 in words is "twenty-seven billion, two hundred five million, seven hundred fifteen thousand, eight hundred forty-nine".