640144346212 has 24 divisors (see below), whose sum is σ = 1286922323456. Its totient is φ = 272926084608.

The previous prime is 640144346203. The next prime is 640144346273. The reversal of 640144346212 is 212643441046.

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, 59223348 + ... + 59234155.

Almost surely, 2^640144346212 is an apocalyptic number.

It is an amenable number.

640144346212 is an abundant number, since it is smaller than the sum of its proper divisors (646777977244).

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

640144346212 is a wasteful number, since it uses less digits than its factorization.

640144346212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118457707 (or 118457705 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

Adding to 640144346212 its reverse (212643441046), we get a palindrome (852787787258).

The spelling of 640144346212 in words is "six hundred forty billion, one hundred forty-four million, three hundred forty-six thousand, two hundred twelve".