85851027217 has 2 divisors, whose sum is σ = 85851027218. Its totient is φ = 85851027216.

The previous prime is 85851027193. The next prime is 85851027281. The reversal of 85851027217 is 71272015858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56206452241 + 29644574976 = 237079^2 + 172176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85851027217 is a prime.

It is not a weakly prime, because it can be changed into another prime (85851025217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42925513608 + 42925513609.

It is an arithmetic number, because the mean of its divisors is an integer number (42925513609).

Almost surely, 2^85851027217 is an apocalyptic number.

It is an amenable number.

85851027217 is a deficient number, since it is larger than the sum of its proper divisors (1).

85851027217 is an equidigital number, since it uses as much as digits as its factorization.

85851027217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 313600, while the sum is 46.

The spelling of 85851027217 in words is "eighty-five billion, eight hundred fifty-one million, twenty-seven thousand, two hundred seventeen".