856646171659 has 4 divisors (see below), whose sum is σ = 856824681600. Its totient is φ = 856467661720.

The previous prime is 856646171653. The next prime is 856646171687. The reversal of 856646171659 is 956171646658.

856646171659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 856646171659 - 2¹¹ = 856646169611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856646171659.

It is not an unprimeable number, because it can be changed into a prime (856646171653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89247772 + ... + 89257369.

It is an arithmetic number, because the mean of its divisors is an integer number (214206170400).

Almost surely, 2^856646171659 is an apocalyptic number.

856646171659 is a deficient number, since it is larger than the sum of its proper divisors (178509941).

856646171659 is a wasteful number, since it uses less digits than its factorization.

856646171659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178509940.

The product of its digits is 65318400, while the sum is 64.

The spelling of 856646171659 in words is "eight hundred fifty-six billion, six hundred forty-six million, one hundred seventy-one thousand, six hundred fifty-nine".