643548473056 has 24 divisors (see below), whose sum is σ = 1269236511144. Its totient is φ = 321202692480.

The previous prime is 643548473033. The next prime is 643548473069. The reversal of 643548473056 is 650374845346.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 643548472988 and 643548473006.

It is a congruent number.

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, 17842455 + ... + 17878486.

It is an arithmetic number, because the mean of its divisors is an integer number (52884854631).

Almost surely, 2^643548473056 is an apocalyptic number.

It is an amenable number.

643548473056 is a deficient number, since it is larger than the sum of its proper divisors (625688038088).

643548473056 is a wasteful number, since it uses less digits than its factorization.

643548473056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35721514 (or 35721506 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 55.

The spelling of 643548473056 in words is "six hundred forty-three billion, five hundred forty-eight million, four hundred seventy-three thousand, fifty-six".