643130423456 has 24 divisors (see below), whose sum is σ = 1286919795924. Its totient is φ = 316293649920.

The previous prime is 643130423431. The next prime is 643130423539. The reversal of 643130423456 is 654324031346.

It can be written as a sum of positive squares in 2 ways, for example, as 643069271056 + 61152400 = 801916^2 + 7820^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164734325 + ... + 164738228.

Almost surely, 2^643130423456 is an apocalyptic number.

It is an amenable number.

643130423456 is an abundant number, since it is smaller than the sum of its proper divisors (643789372468).

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

643130423456 is a wasteful number, since it uses less digits than its factorization.

643130423456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329472624 (or 329472616 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 643130423456 in words is "six hundred forty-three billion, one hundred thirty million, four hundred twenty-three thousand, four hundred fifty-six".