217852660957 has 2 divisors, whose sum is σ = 217852660958. Its totient is φ = 217852660956.

The previous prime is 217852660933. The next prime is 217852660981. The reversal of 217852660957 is 759066258712.

It is a balanced prime because it is at equal distance from previous prime (217852660933) and next prime (217852660981).

It can be written as a sum of positive squares in only one way, i.e., 115650325476 + 102202335481 = 340074^2 + 319691^2 .

It is a cyclic number.

It is not a de Polignac number, because 217852660957 - 2⁷ = 217852660829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217852660457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108926330478 + 108926330479.

It is an arithmetic number, because the mean of its divisors is an integer number (108926330479).

Almost surely, 2^217852660957 is an apocalyptic number.

It is an amenable number.

217852660957 is a deficient number, since it is larger than the sum of its proper divisors (1).

217852660957 is an equidigital number, since it uses as much as digits as its factorization.

217852660957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 217852660957 in words is "two hundred seventeen billion, eight hundred fifty-two million, six hundred sixty thousand, nine hundred fifty-seven".