643220133 has 8 divisors (see below), whose sum is σ = 868483200. Its totient is φ = 423385248.

The previous prime is 643220131. The next prime is 643220141. The reversal of 643220133 is 331022346.

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

It is not a de Polignac number, because 643220133 - 2¹ = 643220131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643220131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356768 + ... + 1357241.

It is an arithmetic number, because the mean of its divisors is an integer number (108560400).

Almost surely, 2^643220133 is an apocalyptic number.

It is an amenable number.

643220133 is a deficient number, since it is larger than the sum of its proper divisors (225263067).

643220133 is a wasteful number, since it uses less digits than its factorization.

643220133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714091.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 643220133 is about 25361.7848938122. The cubic root of 643220133 is about 863.2167850335.

Adding to 643220133 its reverse (331022346), we get a palindrome (974242479).

It can be divided in two parts, 6432 and 20133, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 643220133 in words is "six hundred forty-three million, two hundred twenty thousand, one hundred thirty-three".