646646907 has 16 divisors (see below), whose sum is σ = 871492608. Its totient is φ = 426464640.

The previous prime is 646646899. The next prime is 646646927. The reversal of 646646907 is 709646646.

646646907 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 646646907 - 2³ = 646646899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646646927) 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, 212398 + ... + 215420.

It is an arithmetic number, because the mean of its divisors is an integer number (54468288).

Almost surely, 2^646646907 is an apocalyptic number.

646646907 is a deficient number, since it is larger than the sum of its proper divisors (224845701).

646646907 is a wasteful number, since it uses less digits than its factorization.

646646907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The square root of 646646907 is about 25429.2529776240. The cubic root of 646646907 is about 864.7470083303.

The spelling of 646646907 in words is "six hundred forty-six million, six hundred forty-six thousand, nine hundred seven".