643255604350442 has 8 divisors (see below), whose sum is σ = 990961336431876. Its totient is φ = 312935158873152.

The previous prime is 643255604350427. The next prime is 643255604350451. The reversal of 643255604350442 is 244053406552346.

It can be written as a sum of positive squares in 2 ways, for example, as 540072082781401 + 103183521569041 = 23239451^2 + 10157929^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4346321650943 + ... + 4346321651090.

Almost surely, 2^{643255604350442} is an apocalyptic number.

643255604350442 is a deficient number, since it is larger than the sum of its proper divisors (347705732081434).

643255604350442 is a wasteful number, since it uses less digits than its factorization.

643255604350442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8692643302072.

The product of its (nonzero) digits is 41472000, while the sum is 53.

The spelling of 643255604350442 in words is "six hundred forty-three trillion, two hundred fifty-five billion, six hundred four million, three hundred fifty thousand, four hundred forty-two".