640644504022 has 8 divisors (see below), whose sum is σ = 960971313672. Its totient is φ = 320320732800.

The previous prime is 640644504001. The next prime is 640644504053. The reversal of 640644504022 is 220405446046.

640644504022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127179 + ... + 1139062.

It is an arithmetic number, because the mean of its divisors is an integer number (120121414209).

Almost surely, 2^640644504022 is an apocalyptic number.

640644504022 is a deficient number, since it is larger than the sum of its proper divisors (320326809650).

640644504022 is a wasteful number, since it uses less digits than its factorization.

640644504022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519214.

The product of its (nonzero) digits is 184320, while the sum is 37.

The spelling of 640644504022 in words is "six hundred forty billion, six hundred forty-four million, five hundred four thousand, twenty-two".