851685861085 has 8 divisors (see below), whose sum is σ = 1022190862176. Its totient is φ = 681236802960.

The previous prime is 851685861079. The next prime is 851685861113. The reversal of 851685861085 is 580168586158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 851685861085 - 2⁵ = 851685861053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13952239 + ... + 14013148.

It is an arithmetic number, because the mean of its divisors is an integer number (127773857772).

Almost surely, 2^851685861085 is an apocalyptic number.

It is an amenable number.

851685861085 is a deficient number, since it is larger than the sum of its proper divisors (170505001091).

851685861085 is a wasteful number, since it uses less digits than its factorization.

851685861085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27971483.

The product of its (nonzero) digits is 18432000, while the sum is 61.

The spelling of 851685861085 in words is "eight hundred fifty-one billion, six hundred eighty-five million, eight hundred sixty-one thousand, eighty-five".