643542727245344 has 48 divisors (see below), whose sum is σ = 1289948836226400. Its totient is φ = 315949371538944.

The previous prime is 643542727245337. The next prime is 643542727245349. The reversal of 643542727245344 is 443542727245346.

643542727245344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (643542727245349) 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, 196783037 + ... + 200026620.

It is an arithmetic number, because the mean of its divisors is an integer number (26873934088050).

Almost surely, 2^{643542727245344} is an apocalyptic number.

It is an amenable number.

643542727245344 is an abundant number, since it is smaller than the sum of its proper divisors (646406108981056).

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

643542727245344 is a wasteful number, since it uses less digits than its factorization.

643542727245344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396810585 (or 396810577 counting only the distinct ones).

The product of its digits is 541900800, while the sum is 62.

The spelling of 643542727245344 in words is "six hundred forty-three trillion, five hundred forty-two billion, seven hundred twenty-seven million, two hundred forty-five thousand, three hundred forty-four".