643306634336 has 12 divisors (see below), whose sum is σ = 1266509936412. Its totient is φ = 321653317152.

The previous prime is 643306634251. The next prime is 643306634351. The reversal of 643306634336 is 633436603346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051666130 + ... + 10051666193.

It is an arithmetic number, because the mean of its divisors is an integer number (105542494701).

Almost surely, 2^643306634336 is an apocalyptic number.

It is an amenable number.

643306634336 is a deficient number, since it is larger than the sum of its proper divisors (623203302076).

643306634336 is a wasteful number, since it uses less digits than its factorization.

643306634336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20103332333 (or 20103332325 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 47.

The spelling of 643306634336 in words is "six hundred forty-three billion, three hundred six million, six hundred thirty-four thousand, three hundred thirty-six".