855645663 has 16 divisors (see below), whose sum is σ = 1183666176. Its totient is φ = 549215520.

The previous prime is 855645647. The next prime is 855645731. The reversal of 855645663 is 366546558.

855645663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 855645663 - 2⁴ = 855645647 is a prime.

It is a super-2 number, since 2×855645663² = 1464259001221419138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855645643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5031 + ... + 41672.

It is an arithmetic number, because the mean of its divisors is an integer number (73979136).

Almost surely, 2^855645663 is an apocalyptic number.

855645663 is a deficient number, since it is larger than the sum of its proper divisors (328020513).

855645663 is a wasteful number, since it uses less digits than its factorization.

855645663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46934.

The product of its digits is 2592000, while the sum is 48.

The square root of 855645663 is about 29251.4215551997. The cubic root of 855645663 is about 949.3608491216.

The spelling of 855645663 in words is "eight hundred fifty-five million, six hundred forty-five thousand, six hundred sixty-three".