85128135791 has 2 divisors, whose sum is σ = 85128135792. Its totient is φ = 85128135790.

The previous prime is 85128135779. The next prime is 85128135793. The reversal of 85128135791 is 19753182158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85128135791 - 2¹⁸ = 85127873647 is a prime.

Together with 85128135793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85128135793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42564067895 + 42564067896.

It is an arithmetic number, because the mean of its divisors is an integer number (42564067896).

Almost surely, 2^85128135791 is an apocalyptic number.

85128135791 is a deficient number, since it is larger than the sum of its proper divisors (1).

85128135791 is an equidigital number, since it uses as much as digits as its factorization.

85128135791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 50.

The spelling of 85128135791 in words is "eighty-five billion, one hundred twenty-eight million, one hundred thirty-five thousand, seven hundred ninety-one".