863585855 has 16 divisors (see below), whose sum is σ = 1141712928. Its totient is φ = 621840000.

The previous prime is 863585843. The next prime is 863585881. The reversal of 863585855 is 558585368.

It is not a de Polignac number, because 863585855 - 2⁶ = 863585791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 863585797 and 863585806.

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, 72176 + ... + 83285.

It is an arithmetic number, because the mean of its divisors is an integer number (71357058).

Almost surely, 2^863585855 is an apocalyptic number.

863585855 is a deficient number, since it is larger than the sum of its proper divisors (278127073).

863585855 is a wasteful number, since it uses less digits than its factorization.

863585855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155578.

The product of its digits is 5760000, while the sum is 53.

The square root of 863585855 is about 29386.8313194873. The cubic root of 863585855 is about 952.2884276446.

The spelling of 863585855 in words is "eight hundred sixty-three million, five hundred eighty-five thousand, eight hundred fifty-five".