643650283 has 4 divisors (see below), whose sum is σ = 643884840. Its totient is φ = 643415728.

The previous prime is 643650281. The next prime is 643650317. The reversal of 643650283 is 382056346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643650283 - 2¹ = 643650281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643650281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113113 + ... + 118666.

It is an arithmetic number, because the mean of its divisors is an integer number (160971210).

Almost surely, 2^643650283 is an apocalyptic number.

643650283 is a deficient number, since it is larger than the sum of its proper divisors (234557).

643650283 is a wasteful number, since it uses less digits than its factorization.

643650283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234556.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 643650283 is about 25370.2637550342. The cubic root of 643650283 is about 863.4091660140.

The spelling of 643650283 in words is "six hundred forty-three million, six hundred fifty thousand, two hundred eighty-three".