27973576217 has 2 divisors, whose sum is σ = 27973576218. Its totient is φ = 27973576216.

The previous prime is 27973576153. The next prime is 27973576219. The reversal of 27973576217 is 71267537972.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23230637056 + 4742939161 = 152416^2 + 68869^2 .

It is a cyclic number.

It is not a de Polignac number, because 27973576217 - 2⁶ = 27973576153 is a prime.

Together with 27973576219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27973576219) 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 as a sum of consecutive naturals, namely, 13986788108 + 13986788109.

It is an arithmetic number, because the mean of its divisors is an integer number (13986788109).

Almost surely, 2^27973576217 is an apocalyptic number.

It is an amenable number.

27973576217 is a deficient number, since it is larger than the sum of its proper divisors (1).

27973576217 is an equidigital number, since it uses as much as digits as its factorization.

27973576217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7779240, while the sum is 56.

The spelling of 27973576217 in words is "twenty-seven billion, nine hundred seventy-three million, five hundred seventy-six thousand, two hundred seventeen".