856808844855 has 16 divisors (see below), whose sum is σ = 1372049103744. Its totient is φ = 456579733280.

The previous prime is 856808844809. The next prime is 856808844901. The reversal of 856808844855 is 558448808658.

It is an interprime number because it is at equal distance from previous prime (856808844809) and next prime (856808844901).

It is not a de Polignac number, because 856808844855 - 2¹⁴ = 856808828471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856808844855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24043101 + ... + 24078710.

It is an arithmetic number, because the mean of its divisors is an integer number (85753068984).

Almost surely, 2^856808844855 is an apocalyptic number.

856808844855 is a deficient number, since it is larger than the sum of its proper divisors (515240258889).

856808844855 is a wasteful number, since it uses less digits than its factorization.

856808844855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48123006.

The product of its (nonzero) digits is 393216000, while the sum is 69.

The spelling of 856808844855 in words is "eight hundred fifty-six billion, eight hundred eight million, eight hundred forty-four thousand, eight hundred fifty-five".