646646646 has 32 divisors (see below), whose sum is σ = 1441445760. Its totient is φ = 192191616.

The previous prime is 646646641. The next prime is 646646653.

646646646 is nontrivially palindromic in base 10.

646646646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

646646646 is a modest number, since divided by 646646 gives 646 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 646646595 and 646646604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646646641) 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, 164896 + ... + 168771.

It is an arithmetic number, because the mean of its divisors is an integer number (45045180).

Almost surely, 2^646646646 is an apocalyptic number.

646646646 is an abundant number, since it is smaller than the sum of its proper divisors (794799114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646646646 is a wasteful number, since it uses less digits than its factorization.

646646646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333708.

The product of its digits is 2985984, while the sum is 48.

The square root of 646646646 is about 25429.2478457386. The cubic root of 646646646 is about 864.7468919870.

The spelling of 646646646 in words is "six hundred forty-six million, six hundred forty-six thousand, six hundred forty-six".