643338371 has 8 divisors (see below), whose sum is σ = 693538944. Its totient is φ = 593239680.

The previous prime is 643338337. The next prime is 643338379. The reversal of 643338371 is 173833346.

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

It is a cyclic number.

It is not a de Polignac number, because 643338371 - 2¹⁸ = 643076227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643338379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12086 + ... + 37851.

It is an arithmetic number, because the mean of its divisors is an integer number (86692368).

Almost surely, 2^643338371 is an apocalyptic number.

643338371 is a deficient number, since it is larger than the sum of its proper divisors (50200573).

643338371 is a wasteful number, since it uses less digits than its factorization.

643338371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50941.

The product of its digits is 108864, while the sum is 38.

The square root of 643338371 is about 25364.1158134874. The cubic root of 643338371 is about 863.2696745331.

The spelling of 643338371 in words is "six hundred forty-three million, three hundred thirty-eight thousand, three hundred seventy-one".