640144022515311 has 32 divisors (see below), whose sum is σ = 860318417203200. Its totient is φ = 423379709948160.

The previous prime is 640144022515289. The next prime is 640144022515337. The reversal of 640144022515311 is 113515220441046.

It is not a de Polignac number, because 640144022515311 - 2¹⁷ = 640144022384239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640144022515311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640144022505311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6040922250 + ... + 6041028216.

It is an arithmetic number, because the mean of its divisors is an integer number (26884950537600).

Almost surely, 2^{640144022515311} is an apocalyptic number.

640144022515311 is a deficient number, since it is larger than the sum of its proper divisors (220174394687889).

640144022515311 is a wasteful number, since it uses less digits than its factorization.

640144022515311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137799.

The product of its (nonzero) digits is 115200, while the sum is 39.

Adding to 640144022515311 its reverse (113515220441046), we get a palindrome (753659242956357).

The spelling of 640144022515311 in words is "six hundred forty trillion, one hundred forty-four billion, twenty-two million, five hundred fifteen thousand, three hundred eleven".