644342420456214 has 32 divisors (see below), whose sum is σ = 1289755170363744. Its totient is φ = 214602486228480.

The previous prime is 644342420456177. The next prime is 644342420456249. The reversal of 644342420456214 is 412654024243446.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29655742 + ... + 46563374.

It is an arithmetic number, because the mean of its divisors is an integer number (40304849073867).

Almost surely, 2^{644342420456214} is an apocalyptic number.

644342420456214 is an abundant number, since it is smaller than the sum of its proper divisors (645412749907530).

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

644342420456214 is a wasteful number, since it uses less digits than its factorization.

644342420456214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16912912.

The product of its (nonzero) digits is 17694720, while the sum is 51.

The spelling of 644342420456214 in words is "six hundred forty-four trillion, three hundred forty-two billion, four hundred twenty million, four hundred fifty-six thousand, two hundred fourteen".