644253055241 has 8 divisors (see below), whose sum is σ = 678799101120. Its totient is φ = 609770808432.

The previous prime is 644253055217. The next prime is 644253055247. The reversal of 644253055241 is 142550352446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 644253055241 - 2¹⁰ = 644253054217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644253055247) 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, 15929030 + ... + 15969423.

It is an arithmetic number, because the mean of its divisors is an integer number (84849887640).

Almost surely, 2^644253055241 is an apocalyptic number.

It is an amenable number.

644253055241 is a deficient number, since it is larger than the sum of its proper divisors (34546045879).

644253055241 is a wasteful number, since it uses less digits than its factorization.

644253055241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31899535.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 644253055241 in words is "six hundred forty-four billion, two hundred fifty-three million, fifty-five thousand, two hundred forty-one".