643032544641 has 128 divisors (see below), whose sum is σ = 982977085440. Its totient is φ = 372075379200.

The previous prime is 643032544607. The next prime is 643032544673. The reversal of 643032544641 is 146445230346.

It is not a de Polignac number, because 643032544641 - 2²⁷ = 642898326913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643032544593 and 643032544602.

It is not an unprimeable number, because it can be changed into a prime (643032544601) 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 127 ways as a sum of consecutive naturals, for example, 432435400 + ... + 432436886.

It is an arithmetic number, because the mean of its divisors is an integer number (7679508480).

Almost surely, 2^643032544641 is an apocalyptic number.

It is an amenable number.

643032544641 is a deficient number, since it is larger than the sum of its proper divisors (339944540799).

643032544641 is a wasteful number, since it uses less digits than its factorization.

643032544641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755.

The product of its (nonzero) digits is 829440, while the sum is 42.

Adding to 643032544641 its reverse (146445230346), we get a palindrome (789477774987).

The spelling of 643032544641 in words is "six hundred forty-three billion, thirty-two million, five hundred forty-four thousand, six hundred forty-one".