856476661685 has 8 divisors (see below), whose sum is σ = 1037750363520. Its totient is φ = 678529083024.

The previous prime is 856476661673. The next prime is 856476661693. The reversal of 856476661685 is 586166674658.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856476661685 is a prime.

It is a super-2 number, since 2×856476661685² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831530225 + ... + 831531254.

It is an arithmetic number, because the mean of its divisors is an integer number (129718795440).

Almost surely, 2^856476661685 is an apocalyptic number.

It is an amenable number.

856476661685 is a deficient number, since it is larger than the sum of its proper divisors (181273701835).

856476661685 is a wasteful number, since it uses less digits than its factorization.

856476661685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663061587.

The product of its digits is 348364800, while the sum is 68.

The spelling of 856476661685 in words is "eight hundred fifty-six billion, four hundred seventy-six million, six hundred sixty-one thousand, six hundred eighty-five".