857686837871 has 8 divisors (see below), whose sum is σ = 859057409760. Its totient is φ = 856316441952.

The previous prime is 857686837859. The next prime is 857686837877. The reversal of 857686837871 is 178738686758.

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

It is a cyclic number.

It is not a de Polignac number, because 857686837871 - 2³⁰ = 856613096047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857686837877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12574766 + ... + 12642788.

It is an arithmetic number, because the mean of its divisors is an integer number (107382176220).

Almost surely, 2^857686837871 is an apocalyptic number.

857686837871 is a deficient number, since it is larger than the sum of its proper divisors (1370571889).

857686837871 is a wasteful number, since it uses less digits than its factorization.

857686837871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87985.

The product of its digits is 758661120, while the sum is 74.

The spelling of 857686837871 in words is "eight hundred fifty-seven billion, six hundred eighty-six million, eight hundred thirty-seven thousand, eight hundred seventy-one".