643044020632 has 16 divisors (see below), whose sum is σ = 1298454272640. Its totient is φ = 296789547936.

The previous prime is 643044020629. The next prime is 643044020659. The reversal of 643044020632 is 236020440346.

It is a super-2 number, since 2×643044020632² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3091557688 + ... + 3091557895.

It is an arithmetic number, because the mean of its divisors is an integer number (81153392040).

Almost surely, 2^643044020632 is an apocalyptic number.

It is an amenable number.

643044020632 is an abundant number, since it is smaller than the sum of its proper divisors (655410252008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643044020632 is a wasteful number, since it uses less digits than its factorization.

643044020632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6183115602 (or 6183115598 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 643044020632 its reverse (236020440346), we get a palindrome (879064460978).

The spelling of 643044020632 in words is "six hundred forty-three billion, forty-four million, twenty thousand, six hundred thirty-two".