643120594704 has 135 divisors (see below), whose sum is σ = 2093915923047. Its totient is φ = 183729494592.

The previous prime is 643120594693. The next prime is 643120594763. The reversal of 643120594704 is 407495021346.

The square root of 643120594704 is 801948.

It is a perfect power (a square), and thus also a powerful number.

643120594704 is a `hidden beast` number, since 6 + 4 + 3 + 120 + 59 + 470 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 643120594704.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 67358859 + ... + 67368405.

Almost surely, 2^643120594704 is an apocalyptic number.

643120594704 is the 801948-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643120594704

643120594704 is an abundant number, since it is smaller than the sum of its proper divisors (1450795328343).

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

643120594704 is an frugal number, since it uses more digits than its factorization.

643120594704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19122 (or 9559 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 643120594704 in words is "six hundred forty-three billion, one hundred twenty million, five hundred ninety-four thousand, seven hundred four".