640323556122 has 32 divisors (see below), whose sum is σ = 1351342362240. Its totient is φ = 201867184640.

The previous prime is 640323556121. The next prime is 640323556127. The reversal of 640323556122 is 221655323046.

It is not an unprimeable number, because it can be changed into a prime (640323556121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26055279 + ... + 26079842.

It is an arithmetic number, because the mean of its divisors is an integer number (42229448820).

Almost surely, 2^640323556122 is an apocalyptic number.

640323556122 is an abundant number, since it is smaller than the sum of its proper divisors (711018806118).

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

640323556122 is a wasteful number, since it uses less digits than its factorization.

640323556122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52135238.

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 640323556122 its reverse (221655323046), we get a palindrome (861978879168).

The spelling of 640323556122 in words is "six hundred forty billion, three hundred twenty-three million, five hundred fifty-six thousand, one hundred twenty-two".