646018845 has 8 divisors (see below), whose sum is σ = 1033630176. Its totient is φ = 344543376.

The previous prime is 646018843. The next prime is 646018883. The reversal of 646018845 is 548810646.

646018845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646018845 - 2¹ = 646018843 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 646018797 and 646018806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646018843) 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, 21533947 + ... + 21533976.

It is an arithmetic number, because the mean of its divisors is an integer number (129203772).

Almost surely, 2^646018845 is an apocalyptic number.

It is an amenable number.

646018845 is a deficient number, since it is larger than the sum of its proper divisors (387611331).

646018845 is a wasteful number, since it uses less digits than its factorization.

646018845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43067931.

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 646018845 is about 25416.9007748781. The cubic root of 646018845 is about 864.4669530380.

The spelling of 646018845 in words is "six hundred forty-six million, eighteen thousand, eight hundred forty-five".