85171297873 has 2 divisors, whose sum is σ = 85171297874. Its totient is φ = 85171297872.

The previous prime is 85171297847. The next prime is 85171297879. The reversal of 85171297873 is 37879217158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52072045249 + 33099252624 = 228193^2 + 181932^2 .

It is a cyclic number.

It is not a de Polignac number, because 85171297873 - 2³³ = 76581363281 is a prime.

It is not a weakly prime, because it can be changed into another prime (85171297879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42585648936 + 42585648937.

It is an arithmetic number, because the mean of its divisors is an integer number (42585648937).

Almost surely, 2^85171297873 is an apocalyptic number.

It is an amenable number.

85171297873 is a deficient number, since it is larger than the sum of its proper divisors (1).

85171297873 is an equidigital number, since it uses as much as digits as its factorization.

85171297873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 58.

The spelling of 85171297873 in words is "eighty-five billion, one hundred seventy-one million, two hundred ninety-seven thousand, eight hundred seventy-three".