643777041 has 8 divisors (see below), whose sum is σ = 859543360. Its totient is φ = 428597712.

The previous prime is 643777009. The next prime is 643777049. The reversal of 643777041 is 140777346.

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

It is not a de Polignac number, because 643777041 - 2⁵ = 643777009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643777049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144181 + ... + 148578.

It is an arithmetic number, because the mean of its divisors is an integer number (107442920).

Almost surely, 2^643777041 is an apocalyptic number.

It is an amenable number.

643777041 is a deficient number, since it is larger than the sum of its proper divisors (215766319).

643777041 is a wasteful number, since it uses less digits than its factorization.

643777041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293495.

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 643777041 is about 25372.7617929149. The cubic root of 643777041 is about 863.4658411155.

The spelling of 643777041 in words is "six hundred forty-three million, seven hundred seventy-seven thousand, forty-one".