643704558242 has 16 divisors (see below), whose sum is σ = 966006643680. Its totient is φ = 321702387552.

The previous prime is 643704558179. The next prime is 643704558251. The reversal of 643704558242 is 242855407346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59273009 + ... + 59283867.

It is an arithmetic number, because the mean of its divisors is an integer number (60375415230).

Almost surely, 2^643704558242 is an apocalyptic number.

643704558242 is a deficient number, since it is larger than the sum of its proper divisors (322302085438).

643704558242 is a wasteful number, since it uses less digits than its factorization.

643704558242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21937.

The product of its (nonzero) digits is 6451200, while the sum is 50.

The spelling of 643704558242 in words is "six hundred forty-three billion, seven hundred four million, five hundred fifty-eight thousand, two hundred forty-two".