643630232241 has 12 divisors (see below), whose sum is σ = 929698233360. Its totient is φ = 429082150680.

The previous prime is 643630232209. The next prime is 643630232261. The reversal of 643630232241 is 142232036346.

643630232241 is a `hidden beast` number, since 64 + 363 + 0 + 232 + 2 + 4 + 1 = 666.

It is not a de Polignac number, because 643630232241 - 2⁵ = 643630232209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643630232196 and 643630232205.

It is not an unprimeable number, because it can be changed into a prime (643630232261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621670 + ... + 1293728.

It is an arithmetic number, because the mean of its divisors is an integer number (77474852780).

Almost surely, 2^643630232241 is an apocalyptic number.

It is an amenable number.

643630232241 is a deficient number, since it is larger than the sum of its proper divisors (286068001119).

643630232241 is a wasteful number, since it uses less digits than its factorization.

643630232241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778476 (or 778473 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

Adding to 643630232241 its reverse (142232036346), we get a palindrome (785862268587).

The spelling of 643630232241 in words is "six hundred forty-three billion, six hundred thirty million, two hundred thirty-two thousand, two hundred forty-one".