643313665244 has 24 divisors (see below), whose sum is σ = 1165078071360. Its totient is φ = 310442949824.

The previous prime is 643313665207. The next prime is 643313665333. The reversal of 643313665244 is 442566313346.

643313665244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795419 + ... + 1385394.

It is an arithmetic number, because the mean of its divisors is an integer number (48544919640).

Almost surely, 2^643313665244 is an apocalyptic number.

It is an amenable number.

643313665244 is a deficient number, since it is larger than the sum of its proper divisors (521764406116).

643313665244 is a wasteful number, since it uses less digits than its factorization.

643313665244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183389 (or 2183387 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 47.

The spelling of 643313665244 in words is "six hundred forty-three billion, three hundred thirteen million, six hundred sixty-five thousand, two hundred forty-four".