643566234066 has 32 divisors (see below), whose sum is σ = 1557538450560. Its totient is φ = 173059827456.

The previous prime is 643566234023. The next prime is 643566234071. The reversal of 643566234066 is 660432665346.

643566234066 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon 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, 450675921 + ... + 450677348.

It is an arithmetic number, because the mean of its divisors is an integer number (48673076580).

Almost surely, 2^643566234066 is an apocalyptic number.

643566234066 is an abundant number, since it is smaller than the sum of its proper divisors (913972216494).

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

643566234066 is a wasteful number, since it uses less digits than its factorization.

643566234066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901353298.

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

The spelling of 643566234066 in words is "six hundred forty-three billion, five hundred sixty-six million, two hundred thirty-four thousand, sixty-six".