851685861086 has 4 divisors (see below), whose sum is σ = 1277528791632. Its totient is φ = 425842930542.

The previous prime is 851685861079. The next prime is 851685861113. The reversal of 851685861086 is 680168586158.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 212921465270 + ... + 212921465273.

It is an arithmetic number, because the mean of its divisors is an integer number (319382197908).

Almost surely, 2^851685861086 is an apocalyptic number.

851685861086 is a deficient number, since it is larger than the sum of its proper divisors (425842930546).

851685861086 is a wasteful number, since it uses less digits than its factorization.

851685861086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425842930545.

The product of its (nonzero) digits is 22118400, while the sum is 62.

The spelling of 851685861086 in words is "eight hundred fifty-one billion, six hundred eighty-five million, eight hundred sixty-one thousand, eighty-six".