643312032541 has 8 divisors (see below), whose sum is σ = 649063204160. Its totient is φ = 637576904448.

The previous prime is 643312032529. The next prime is 643312032569. The reversal of 643312032541 is 145230213346.

It is a happy number.

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 643312032541 - 2⁷ = 643312032413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643312032497 and 643312032506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643312032521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3930321 + ... + 4090726.

It is an arithmetic number, because the mean of its divisors is an integer number (81132900520).

Almost surely, 2^643312032541 is an apocalyptic number.

It is an amenable number.

643312032541 is a deficient number, since it is larger than the sum of its proper divisors (5751171619).

643312032541 is a wasteful number, since it uses less digits than its factorization.

643312032541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8021763.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 643312032541 its reverse (145230213346), we get a palindrome (788542245887).

The spelling of 643312032541 in words is "six hundred forty-three billion, three hundred twelve million, thirty-two thousand, five hundred forty-one".