85870851173 has 2 divisors, whose sum is σ = 85870851174. Its totient is φ = 85870851172.

The previous prime is 85870851169. The next prime is 85870851203. The reversal of 85870851173 is 37115807858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61045067329 + 24825783844 = 247073^2 + 157562^2 .

It is a cyclic number.

It is not a de Polignac number, because 85870851173 - 2² = 85870851169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85870851103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42935425586 + 42935425587.

It is an arithmetic number, because the mean of its divisors is an integer number (42935425587).

Almost surely, 2^85870851173 is an apocalyptic number.

It is an amenable number.

85870851173 is a deficient number, since it is larger than the sum of its proper divisors (1).

85870851173 is an equidigital number, since it uses as much as digits as its factorization.

85870851173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1881600, while the sum is 53.

The spelling of 85870851173 in words is "eighty-five billion, eight hundred seventy million, eight hundred fifty-one thousand, one hundred seventy-three".