85643122121785 has 32 divisors (see below), whose sum is σ = 108015288438528. Its totient is φ = 65063253319680.

The previous prime is 85643122121771. The next prime is 85643122121861. The reversal of 85643122121785 is 58712122134658.

It is not a de Polignac number, because 85643122121785 - 2⁹ = 85643122121273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6968349 + ... + 14827141.

It is an arithmetic number, because the mean of its divisors is an integer number (3375477763704).

Almost surely, 2^{85643122121785} is an apocalyptic number.

It is an amenable number.

85643122121785 is a deficient number, since it is larger than the sum of its proper divisors (22372166316743).

85643122121785 is a wasteful number, since it uses less digits than its factorization.

85643122121785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7859505.

The product of its digits is 6451200, while the sum is 55.

The spelling of 85643122121785 in words is "eighty-five trillion, six hundred forty-three billion, one hundred twenty-two million, one hundred twenty-one thousand, seven hundred eighty-five".