640839324671 has 128 divisors (see below), whose sum is σ = 915880089600. Its totient is φ = 433544970240.

The previous prime is 640839324607. The next prime is 640839324683. The reversal of 640839324671 is 176423938046.

It is a cyclic number.

It is not a de Polignac number, because 640839324671 - 2⁶ = 640839324607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640839324871) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 71097161 + ... + 71106173.

It is an arithmetic number, because the mean of its divisors is an integer number (7155313200).

Almost surely, 2^640839324671 is an apocalyptic number.

640839324671 is a deficient number, since it is larger than the sum of its proper divisors (275040764929).

640839324671 is a wasteful number, since it uses less digits than its factorization.

640839324671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9169.

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 640839324671 in words is "six hundred forty billion, eight hundred thirty-nine million, three hundred twenty-four thousand, six hundred seventy-one".