85387843217 has 2 divisors, whose sum is σ = 85387843218. Its totient is φ = 85387843216.

The previous prime is 85387843201. The next prime is 85387843283. The reversal of 85387843217 is 71234878358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78218664976 + 7169178241 = 279676^2 + 84671^2 .

It is a cyclic number.

It is not a de Polignac number, because 85387843217 - 2⁴ = 85387843201 is a prime.

It is not a weakly prime, because it can be changed into another prime (85387863217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42693921608 + 42693921609.

It is an arithmetic number, because the mean of its divisors is an integer number (42693921609).

Almost surely, 2^85387843217 is an apocalyptic number.

It is an amenable number.

85387843217 is a deficient number, since it is larger than the sum of its proper divisors (1).

85387843217 is an equidigital number, since it uses as much as digits as its factorization.

85387843217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 56.

The spelling of 85387843217 in words is "eighty-five billion, three hundred eighty-seven million, eight hundred forty-three thousand, two hundred seventeen".