643632770396 has 48 divisors (see below), whose sum is σ = 1404507616512. Its totient is φ = 250727097600.

The previous prime is 643632770381. The next prime is 643632770437. The reversal of 643632770396 is 693077236346.

643632770396 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 15 ways as a sum of consecutive naturals, for example, 1866851 + ... + 2184581.

It is an arithmetic number, because the mean of its divisors is an integer number (29260575344).

Almost surely, 2^643632770396 is an apocalyptic number.

It is an amenable number.

643632770396 is an abundant number, since it is smaller than the sum of its proper divisors (760874846116).

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

643632770396 is a wasteful number, since it uses less digits than its factorization.

643632770396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324330 (or 324328 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 56.

The spelling of 643632770396 in words is "six hundred forty-three billion, six hundred thirty-two million, seven hundred seventy thousand, three hundred ninety-six".