85942128257 has 4 divisors (see below), whose sum is σ = 85942956720. Its totient is φ = 85941299796.

The previous prime is 85942128247. The next prime is 85942128263. The reversal of 85942128257 is 75282124958.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 85942128257 - 2⁴ = 85942128241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85942128199 and 85942128208.

It is not an unprimeable number, because it can be changed into a prime (85942128247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231863 + ... + 475020.

It is an arithmetic number, because the mean of its divisors is an integer number (21485739180).

Almost surely, 2^85942128257 is an apocalyptic number.

It is an amenable number.

85942128257 is a deficient number, since it is larger than the sum of its proper divisors (828463).

85942128257 is a wasteful number, since it uses less digits than its factorization.

85942128257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828462.

The product of its digits is 3225600, while the sum is 53.

The spelling of 85942128257 in words is "eighty-five billion, nine hundred forty-two million, one hundred twenty-eight thousand, two hundred fifty-seven".