646443116 has 18 divisors (see below), whose sum is σ = 1234440732. Its totient is φ = 293761120.

The previous prime is 646443101. The next prime is 646443121. The reversal of 646443116 is 611344646.

It is a happy number.

646443116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166736 + ... + 170568.

Almost surely, 2^646443116 is an apocalyptic number.

It is an amenable number.

646443116 is a deficient number, since it is larger than the sum of its proper divisors (587997616).

646443116 is an equidigital number, since it uses as much as digits as its factorization.

646443116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7681 (or 3846 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 646443116 is about 25425.2456428645. The cubic root of 646443116 is about 864.6561570111.

The spelling of 646443116 in words is "six hundred forty-six million, four hundred forty-three thousand, one hundred sixteen".