640444464022 has 16 divisors (see below), whose sum is σ = 1109647093392. Its totient is φ = 273986936320.

The previous prime is 640444464013. The next prime is 640444464041. The reversal of 640444464022 is 220464444046.

It is a happy number.

It is a super-2 number, since 2×640444464022² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856208803 + ... + 856209550.

It is an arithmetic number, because the mean of its divisors is an integer number (69352943337).

Almost surely, 2^640444464022 is an apocalyptic number.

640444464022 is a deficient number, since it is larger than the sum of its proper divisors (469202629370).

640444464022 is a wasteful number, since it uses less digits than its factorization.

640444464022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712418383.

The product of its (nonzero) digits is 589824, while the sum is 40.

The spelling of 640444464022 in words is "six hundred forty billion, four hundred forty-four million, four hundred sixty-four thousand, twenty-two".