644413714900 has 18 divisors (see below), whose sum is σ = 1398377761550. Its totient is φ = 257765485920.

The previous prime is 644413714891. The next prime is 644413714913. The reversal of 644413714900 is 9417314446.

It can be written as a sum of positive squares in 3 ways, for example, as 163481796 + 644250233104 = 12786^2 + 802652^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3222068475 + ... + 3222068674.

Almost surely, 2^644413714900 is an apocalyptic number.

It is an amenable number.

644413714900 is an abundant number, since it is smaller than the sum of its proper divisors (753964046650).

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

644413714900 is a wasteful number, since it uses less digits than its factorization.

644413714900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444137163 (or 6444137156 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 644413714900 in words is "six hundred forty-four billion, four hundred thirteen million, seven hundred fourteen thousand, nine hundred".