643221300283 has 4 divisors (see below), whose sum is σ = 654123356280. Its totient is φ = 632319244288.

The previous prime is 643221300251. The next prime is 643221300349. The reversal of 643221300283 is 382003122346.

643221300283 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 643221300283 - 2⁵ = 643221300251 is a prime.

It is a super-2 number, since 2×643221300283² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643221360283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5451027910 + ... + 5451028027.

It is an arithmetic number, because the mean of its divisors is an integer number (163530839070).

Almost surely, 2^643221300283 is an apocalyptic number.

643221300283 is a deficient number, since it is larger than the sum of its proper divisors (10902055997).

643221300283 is a wasteful number, since it uses less digits than its factorization.

643221300283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10902055996.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 643221300283 in words is "six hundred forty-three billion, two hundred twenty-one million, three hundred thousand, two hundred eighty-three".