640665322110 has 48 divisors (see below), whose sum is σ = 1817159825520. Its totient is φ = 155312805120.

The previous prime is 640665322109. The next prime is 640665322127. The reversal of 640665322110 is 11223566046.

640665322110 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 6 + 532 + 2 + 110 = 666.

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 23 ways as a sum of consecutive naturals, for example, 323567355 + ... + 323569334.

It is an arithmetic number, because the mean of its divisors is an integer number (37857496365).

Almost surely, 2^640665322110 is an apocalyptic number.

640665322110 is an abundant number, since it is smaller than the sum of its proper divisors (1176494503410).

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

640665322110 is a wasteful number, since it uses less digits than its factorization.

640665322110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647136713 (or 647136710 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 640665322110 its reverse (11223566046), we get a palindrome (651888888156).

The spelling of 640665322110 in words is "six hundred forty billion, six hundred sixty-five million, three hundred twenty-two thousand, one hundred ten".