640320168342 has 16 divisors (see below), whose sum is σ = 1280667625920. Its totient is φ = 213435507912.

The previous prime is 640320168317. The next prime is 640320168359. The reversal of 640320168342 is 243861023046.

It is a self number, because there is not a number n which added to its sum of digits gives 640320168342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825448 + ... + 1400715.

It is an arithmetic number, because the mean of its divisors is an integer number (80041726620).

Almost surely, 2^640320168342 is an apocalyptic number.

640320168342 is an abundant number, since it is smaller than the sum of its proper divisors (640347457578).

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

640320168342 is a wasteful number, since it uses less digits than its factorization.

640320168342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274107.

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 640320168342 in words is "six hundred forty billion, three hundred twenty million, one hundred sixty-eight thousand, three hundred forty-two".