217608936973 has 2 divisors, whose sum is σ = 217608936974. Its totient is φ = 217608936972.

The previous prime is 217608936949. The next prime is 217608936989. The reversal of 217608936973 is 379639806712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196459924644 + 21149012329 = 443238^2 + 145427^2 .

It is a cyclic number.

It is not a de Polignac number, because 217608936973 - 2³⁷ = 80169983501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217608936073) 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, 108804468486 + 108804468487.

It is an arithmetic number, because the mean of its divisors is an integer number (108804468487).

Almost surely, 2^217608936973 is an apocalyptic number.

It is an amenable number.

217608936973 is a deficient number, since it is larger than the sum of its proper divisors (1).

217608936973 is an equidigital number, since it uses as much as digits as its factorization.

217608936973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20575296, while the sum is 61.

The spelling of 217608936973 in words is "two hundred seventeen billion, six hundred eight million, nine hundred thirty-six thousand, nine hundred seventy-three".