643622502136326 has 64 divisors (see below), whose sum is σ = 1329521931724800. Its totient is φ = 207502532939520.

The previous prime is 643622502136297. The next prime is 643622502136337. The reversal of 643622502136326 is 623631205226346.

643622502136326 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 31 ways as a sum of consecutive naturals, for example, 11396966826 + ... + 11397023298.

It is an arithmetic number, because the mean of its divisors is an integer number (20773780183200).

Almost surely, 2^{643622502136326} is an apocalyptic number.

643622502136326 is an abundant number, since it is smaller than the sum of its proper divisors (685899429588474).

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

643622502136326 is a wasteful number, since it uses less digits than its factorization.

643622502136326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90141.

The product of its (nonzero) digits is 11197440, while the sum is 51.

The spelling of 643622502136326 in words is "six hundred forty-three trillion, six hundred twenty-two billion, five hundred two million, one hundred thirty-six thousand, three hundred twenty-six".