27715660217 has 4 divisors (see below), whose sum is σ = 31675040256. Its totient is φ = 23756280180.

The previous prime is 27715660213. The next prime is 27715660223. The reversal of 27715660217 is 71206651772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27715660217 - 2² = 27715660213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27715660213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979690009 + ... + 1979690022.

It is an arithmetic number, because the mean of its divisors is an integer number (7918760064).

Almost surely, 2^27715660217 is an apocalyptic number.

It is an amenable number.

27715660217 is a deficient number, since it is larger than the sum of its proper divisors (3959380039).

27715660217 is an equidigital number, since it uses as much as digits as its factorization.

27715660217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959380038.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 27715660217 in words is "twenty-seven billion, seven hundred fifteen million, six hundred sixty thousand, two hundred seventeen".