644234426646100 has 36 divisors (see below), whose sum is σ = 1397989815335008. Its totient is φ = 257693566140000.

The previous prime is 644234426646067. The next prime is 644234426646131. The reversal of 644234426646100 is 1646624432446.

644234426646100 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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223680175 + ... + 226542025.

Almost surely, 2^{644234426646100} is an apocalyptic number.

It is an amenable number.

644234426646100 is an abundant number, since it is smaller than the sum of its proper divisors (753755388688908).

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

644234426646100 is a wasteful number, since it uses less digits than its factorization.

644234426646100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112976 (or 5112969 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 52.

The spelling of 644234426646100 in words is "six hundred forty-four trillion, two hundred thirty-four billion, four hundred twenty-six million, six hundred forty-six thousand, one hundred".