640043331306 has 16 divisors (see below), whose sum is σ = 1280139596064. Its totient is φ = 213338954864.

The previous prime is 640043331259. The next prime is 640043331311. The reversal of 640043331306 is 603133340046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2047500 + ... + 2339303.

It is an arithmetic number, because the mean of its divisors is an integer number (80008724754).

Almost surely, 2^640043331306 is an apocalyptic number.

640043331306 is an abundant number, since it is smaller than the sum of its proper divisors (640096264758).

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

640043331306 is a wasteful number, since it uses less digits than its factorization.

640043331306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411125.

The product of its (nonzero) digits is 46656, while the sum is 33.

The spelling of 640043331306 in words is "six hundred forty billion, forty-three million, three hundred thirty-one thousand, three hundred six".