85855510217 has 2 divisors, whose sum is σ = 85855510218. Its totient is φ = 85855510216.

The previous prime is 85855510183. The next prime is 85855510253. The reversal of 85855510217 is 71201555858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48860449936 + 36995060281 = 221044^2 + 192341^2 .

It is a cyclic number.

It is not a de Polignac number, because 85855510217 - 2¹⁴ = 85855493833 is a prime.

It is not a weakly prime, because it can be changed into another prime (85855510277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42927755108 + 42927755109.

It is an arithmetic number, because the mean of its divisors is an integer number (42927755109).

Almost surely, 2^85855510217 is an apocalyptic number.

It is an amenable number.

85855510217 is a deficient number, since it is larger than the sum of its proper divisors (1).

85855510217 is an equidigital number, since it uses as much as digits as its factorization.

85855510217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560000, while the sum is 47.

The spelling of 85855510217 in words is "eighty-five billion, eight hundred fifty-five million, five hundred ten thousand, two hundred seventeen".