644166206006 has 16 divisors (see below), whose sum is σ = 989557568208. Its totient is φ = 314326370400.

The previous prime is 644166206003. The next prime is 644166206011. The reversal of 644166206006 is 600602661446.

644166206006 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644166206003) 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, 3069605 + ... + 3272736.

It is an arithmetic number, because the mean of its divisors is an integer number (61847348013).

Almost surely, 2^644166206006 is an apocalyptic number.

644166206006 is a deficient number, since it is larger than the sum of its proper divisors (345391362202).

644166206006 is a wasteful number, since it uses less digits than its factorization.

644166206006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6343567.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 644166206006 in words is "six hundred forty-four billion, one hundred sixty-six million, two hundred six thousand, six".