856864555 has 8 divisors (see below), whose sum is σ = 1036334592. Its totient is φ = 680093568.

The previous prime is 856864531. The next prime is 856864559. The reversal of 856864555 is 555468658.

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 856864555 - 2⁷ = 856864427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856864559) 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, 674062 + ... + 675331.

It is an arithmetic number, because the mean of its divisors is an integer number (129541824).

Almost surely, 2^856864555 is an apocalyptic number.

856864555 is a deficient number, since it is larger than the sum of its proper divisors (179470037).

856864555 is a wasteful number, since it uses less digits than its factorization.

856864555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349525.

The product of its digits is 5760000, while the sum is 52.

The square root of 856864555 is about 29272.2488886659. The cubic root of 856864555 is about 949.8114325641.

The spelling of 856864555 in words is "eight hundred fifty-six million, eight hundred sixty-four thousand, five hundred fifty-five".